7. A car, moving uniformly accelerated from rest, accelerates to a speed of 100 km / h in 3 s. How long before the car started moving at 50 km/h?
8. (P) A block on a horizontal table is given a speed of 5 m/s. Under the influence of friction force the bar moves with an acceleration modulo 1 m/s 2 . What is the distance traveled by the block in 6 seconds?
9. (P) On the last kilometer of the braking distance, the speed of the train decreased by 10 m/s. Determine the speed at the start of deceleration if the total braking distances the train was 4 km, and the braking was equally slow.
1) 20 m/s 2) 25 m/s 3) 40 m/s 4) 42 m/s
10. 
The figure shows a stroboscopic photograph of the movement of the ball along the chute. It is known that the time interval between two successive flashes is 0.2 s. The divisions are indicated on the scale. in decimeters. With what acceleration was the ball moving?
3) 5 m/s 2
11. A car moving at speed v, starts to slow down, and in time t its speed is reduced by 2 times. Which the way will pass car during this time if its acceleration was constant?
TASKS FOR COMPARISON
12. One of the characteristics of a car is time t its acceleration from standstill to a speed of 100 km / h. Two cars have acceleration times such that t1 = 2t2. The acceleration of the first car relative to the acceleration of the second car
1) less than 2 times 3) more than 2 times
2) more times 4) more than 4 times
13. A motorcyclist and a cyclist simultaneously start uniformly accelerated movement from a state of rest. The acceleration of a motorcyclist is 3 times greater than that of a cyclist. How many times longer will it take a cyclist to reach a speed of 50 km/h?
1) times 2) times 3) 3 times 4) 9 times
14. Passenger and truck simultaneously start uniformly accelerated motion from rest. The acceleration of a passenger car is 3 times greater than that of a truck. How many times greater speed will develop a car at the same time?
1) 1.5 times 2) times 3) 3 times 4) 9 times
15. In a rectilinear uniformly accelerated motion with zero initial speed, the path traveled by the body in two seconds from the beginning of the movement is greater than the path traveled in the first second, in
1) 2 times 2) 3 times 3) 4 times 4) 5 times
16. A motorcyclist covers a certain distance 3 times faster than a cyclist. If the speed of the cyclist is 8 m/s, then the speed of the cyclist is greater than the speed of the cyclist by
FREE FALL
1. In a tube from which air is evacuated, there are a pellet, a cork and a bird's feather at the same height. Which of these bodies will be the last to reach the bottom of the tube when they fall freely from the same height?
1) Shot
3) Bird feather
All three bodies will reach the bottom of the tube at the same time
2. Two bodies are simultaneously thrown down from the same point with different speeds v 2 >v 1 . How does the distance between bodies change?
1) Remains unchanged.
2) Increasing evenly.
3) Uniformly decreases.
4) The second body relative to the first moves uniformly accelerated.
3. Two drops fall from the faucet one after the other. How does the second drop move in the reference frame associated with the first drop after it is taken off the tap?
1) Uniformly accelerated
2) Equally slow
3) Not moving
evenly up
4. A ball is thrown from the ground at a speed of 5 m/s at an angle of 60° to the horizon. There is no air resistance. At what point in the trajectory of the ball is its acceleration directed horizontally?
1) at a point on the uphill section.
2) in top point trajectories.
3) at all points of the trajectory.
There is no such point.
5. 
The figure shows the trajectory of a body thrown at an angle α
to the horizon at a speed v0. Specify the number of the arrow coinciding in direction with the acceleration vector at the point A.
1) 1 2) 2 3) 3 4) 4
6. When a body falls freely from a state of rest, its speed in the second second will increase by
7. A body fell from a certain height with zero initial velocity and, when it hit the ground, had a velocity of 40 m/s. What is the fall time? Ignore air resistance.
1) 0.25 s 2) 4 s 3) 40 s 4) 400 s
8. A body is thrown vertically upwards with a speed of 20 m/s. Air resistance is negligible. What is the flight time of the body to the point of maximum lift?
9. A body is thrown vertically upwards with an initial speed of 20 m/s. What is the modulus of the body's velocity 0.5 s after the start of motion? Air resistance is ignored.
1) 10 m/s 2) 15 m/s 3) 17.5 m/s 4) 20 m/s
10. A stone broke off from a high rock and began to fall freely. What speed will it have 3 seconds after the start of the fall?
1) 30 m/s 2) 10 m/s 3) 3 m/s 4) 2 m/s
11. A stone thrown vertically upwards from the Earth's surface at a speed of 20 m/s fell back to Earth. Air resistance is low. The stone was in flight for about
1) 1 s 2) 2 s 3) 4 s 4) 8 s
12. 
Figures A and B show photographs of the installation for studying the free fall of bodies. When you press the button on the stopwatch, the ball breaks away from the electromagnet (Fig. A), the stopwatch turns on; when the ball hits the sensor, combined with the beginning of the ruler with centimeter divisions, the stopwatch turns off (Fig. B). The acceleration of free fall, according to the results of the experiment, is equal to
1) 9.57 m/s 2
Rice. A Fig. B
13. A steel ball was released from the roof of a high-rise building. The table shows the results of measurements of the path traveled by the ball, from time to time during its free fall. What, most likely, was the value of the path traveled by the ball during the fall, by the time t= 2 s? Ignore air resistance.
15. (P) A small stone thrown from a flat horizontal surface of the earth at an angle to the horizon fell back to the ground 20 m from the place of the throw. How much time elapsed from the throw to the moment when its speed was directed horizontally and equal to 10 m/s?
1) 0.25 s 2) 0.5 s 3) 1 s 4) 2 s
16. (P) Below is a photograph of a setup for studying uniformly accelerated sliding of a carriage (1) weighing 0.1 kg along an inclined plane set at an angle of 30° to the horizon.
At the moment of the start of movement, the upper sensor (A) turns on the stopwatch (2), and when the carriage passes the lower sensor (B), the stopwatch turns off. The numbers on the ruler indicate the length in centimeters. What expression describes the dependence of the carriage speed on time?
1) v = 1,25t 2) v = 0,5t 3) v = 2,5t 4) v = 1,9t
^ A4. The bus passenger involuntarily leaned forward. What caused it?
1) the bus slowed down
2) the bus turned left
3) the bus increased speed
4) the bus turned right
IN 1. One cyclist traveled 12 s at a speed of 6 m/s, and the second traveled the same path in 9 s. What is the speed of the second cyclist on this section of the path?
AT 2. Two trains of length 360 m each move along parallel tracks towards each other with the same speed of 54 km/h. Which time will pass after the meeting of the trains before their last carriages pass?
C1. A passenger of a train traveling at a speed of 36 km / h sees an oncoming train 75 m long for 3 s. How fast is the oncoming train moving?
C2. From the village A A cyclist is riding on a straight highway. When he moved 18 km from village A, a motorcyclist followed him at a speed of 10 times more speed cyclist and caught up with him in the village B. What is the distance between the villages A and B?
^ Test #1
Option number 2
A1. Of the listed movements, uniform is:
1) the movement of the car when braking
2) the movement of the pendulum of the clock
3) the flow of water in a flat river
4) movement of the body on an inclined plane
^ A2. A motorcycle travels 120 km in 2 hours. What is the average speed of the motorcycle?
A3. Where in relation to the boat will the passengers deviate if the boat turns to the left?
IN 1. Two cars are moving in a straight line and uniformly in the same direction with speeds v) = 54 km/h and v 2 = 36 km/h. At the beginning of the movement, the distance between them was 18 km. How long will it take for the first car to overtake the second car in front?
AT 2. In subversive technology, a fuse that burns at a low speed is used. What length of fickford cord should be taken in order to have time to run back to a distance of 300 m after it is lit? The running speed is 5 m/s, and the flame propagation speed along the cord is 0.8 cm/s.
C.I. The subway escalator lifts a person standing on it in 2 minutes. A passenger climbs a fixed escalator in 6 minutes. How long does it take for a passenger to climb a moving escalator?
C2. Determine the speed of the river flow if a cargo ship travels a distance of 600 km along the current of this river in a day, and 336 km against the current.
Test #2
Option number 1
A1. The subway escalator rises at a speed of 1 m/s. Can a person on an escalator be at rest in a frame of reference linked to the Earth?
can, if it moves against the movement of the escalator at a speed of 1 m / s
can, if it moves in the direction of movement of the escalator at a speed of 1 m / s
maybe if you're on an escalator
A2. One of the characteristics of a car is time t its acceleration from standstill to a speed of 100 km / h. Two cars have such an acceleration time that = The acceleration of the first car relative to the acceleration of the second car:
1) less than 2 times
2) more than V2 times
3) more than 2 times
4) 4 times more
A3, The coordinate of the body changes over time according to the formula x = 5- 3t, where all quantities are expressed in SI units. What is the coordinate of this body 5 s after the start of motion?
^ A4. The dependence of the path on time for a rectilinearly moving body has the form: S(t) = 2t + 31 2 , where all quantities are expressed in SI units. The acceleration of the body is:
1) 1m/s 2
A5. With rectilinear uniformly accelerated motion with zero initial speed, the path traveled by the body in 2 s from the beginning of the movement is greater than the path traveled in the first second:
1) 2 times
2) 3 times
3) 4 times
IN 1. Cat Leopold rides a bicycle past a sign that says "7 km to the city" and after a while past the second pillar - "5 km to the city". What is the change in Leopold's coordinates?
AT 2. The stork flew 3 km north, turned east and flew another 4 km. Find the length of the vector connecting its start and end positions.
C1. At some point in time, the coordinate of the tractor in the chosen reference system is 30 km. Its speed is directed against the direction of the axis and is equal to 20 km/h. What will be the coordinate of the tractor after two hours of movement?
C2. Going up against the river powerboat met rafts floating down the river. One hour after meeting outboard motor stalled. The repair of the motor lasted 30 minutes, and all this time the boat floated freely downstream. After the repair, the boat swam downstream at the same speed relative to the water and caught up with the rafts at a distance of 7.5 km from the place of their first meeting. Determine the speed of the river.
Test #2
Option number 2
A1. Two cars are moving along a straight road in the same direction, one at 50 km/h and the other at 70 km/h. At the same time, cars:
1) get closer
2) are removed
3) travel at a constant distance from each other
4) can approach, or can move away
^ A2. A car moving away moves with an acceleration of 3 m/s 2 . After 4 seconds, the speed of the car will be:
A3. A motorcyclist and a cyclist simultaneously start uniformly accelerated movement from a state of rest. The acceleration of a motorcyclist is 3 times greater than that of a cyclist. How many times longer will it take a cyclist to reach a speed of 50 km/h?
3) 3 times
^ A4. The dependence of the coordinate of some body on time is described by the equation X = 8t-t 2 , where all quantities are expressed in SI units. At what point in time is the body's velocity zero?
A5. The arrow is launched vertically upwards. The projection of its velocity on the vertical direction changes over time in accordance with the graph. (See figure.) At what point in time did the arrow reach maximum height?
point in time the arrow reached its maximum height?
30 20
10
0 -10
-20
-30
IN 1. winnie the pooh climbs on balloon to the hollow, but at a height of 10 m the ball bursts and Pooh falls to the ground. What is the change in Pooh's coordinates?
AT 2. Robin Hood fired his bow at an angle of 60° to the horizon. The arrow at the moment of the beginning of the movement had a speed of 40 m/s. Find the projection of the arrow speed on the horizontal axis.
C1. At some point in time, the coordinate of the car in the chosen reference system was 120 km, after 2 hours of its movement, the coordinate was 10 km. Find the projection of the speed of this car on the axle.
C2. Two trains left Moscow for Pushkino with a time interval t equal to 10 minutes at a speed of 30 km/h. At what speed v 2 did the train going to Moscow move if it met these trains 4 minutes after each other?
Test #3
Option number 1
A1. In the first hour, the car traveled 40 km, and in the next 2 hours - another 110 km. Find average speed vehicle movement.
^ A2. What is called the mechanical movement of the body?
^ A3. What is progressive movement?
1) all kinds of changes in the position of the body that occur in the world around
2) change in the position of the body in space relative to other bodies over time
3) movement in which the trajectories of all points of the body are exactly the same
4) a movement in which a body travels the same distance in any equal intervals of time
A4. An airplane flies at a speed of 360 km/h. An aircraft propeller with a diameter of 200 cm rotates at a frequency of 1800 rpm. The speed of the end of the propeller relative to a stationary observer on the ground is:
A5. A stone is thrown from a vertical cliff 10 m high at a speed of 20 m/s at an angle of 45° to the horizontal. If air resistance can be neglected, then the maximum height of the stone above the ground and the range of its flight are, respectively:
B.I. The subway escalator lowers a person walking down it in 1.5 minutes. If a person walks twice as fast, he will descend in 60 seconds. The time it takes for a person standing on the escalator to go down is:
AT 2. From a helicopter ascending at a speed of 8 m / s, at a height of 17 m, an object fell out that will fall to the ground through:
VZ. In calm weather, raindrops leave traces on the window of a bus uniformly moving at a speed of 10 m/s, directed at an angle of 60° to the vertical. Determine the speed of the drops relative to the ground.
C1. A body falls freely without initial velocity from a height of 1210 m. Determine the average velocity in the lower half of the path.
C2. A ball that bounced vertically upwards from the surface of the earth at a speed of 10 m/s flew past the window of a house 1.5 m high in a time of 0.2 s. How high is the top edge of the window relative to the ground?
Option number 2
A1. The boy rotates a stone tied to a rope 50 cm long in a vertical plane, making 3 revs / s. The height to which the stone will fly if the rope breaks at the moment when the linear velocity is directed vertically upwards is equal to:
^ A2. What movement is called uneven?
1) all kinds of changes in the position of the body that occur in the world around
2) change in the position of the body in space relative to other bodies over time
3) movement in which the trajectories of all points of the body are exactly the same
4) a movement in which a body travels the same distance in any equal intervals of time
^ A3. What is called uniform motion?
1) all kinds of changes in the position of the body that occur in the world around
2) change in the position of the body in space relative to other bodies over time
3) movement in which the trajectories of all points of the body are exactly the same
4) movement with constant modulo and direction speed
^ A4. In order for a stone thrown at an angle of 45 ° to the horizon to reach a height of 2.5 m, it needs to be given a minimum speed:
^ A5. A body is thrown horizontally from a height of 20 m. The trajectory of its movement is described by the equation y = 20 - 0.05x 2 . The speed with which the body was thrown is:
IN 1. A boat crosses the river, maintaining a course perpendicular to the flow of the river. The speed of the boat relative to the water is 1.4 m/s, the speed of the current is 70 cm/s, the width of the river is 308 m. How long will it take the boat to reach the other bank?
AT 2. A pedestrian moves away from a pole, at the end of which a lantern is fixed, at a speed of 6 km/h. The height of the pedestrian is 1.8 m, the height of the column is 4.8 m. Determine the rate of increase in the length of the pedestrian's shadow.
VZ. The boat covers the distance between two piers on the river downstream in 600 s, and against the current in 900 s. How long will it take the boat to cover this distance across the lake?
C1. IN the last second of free fall, the body traveled a quarter of the entire path. Determine the time of the fall of the body.
C2. A body slides at a speed of 10 m/s along a horizontal plane, approaching the slot. The slot is formed by two sheer parallel walls, the distance between which is 0.2 m. How many times will the body hit the walls before it falls to the bottom if the slot is 5 m deep and the impact on the wall is absolutely elastic?
^
Additional material
A2 -33 KIM2008
When we say that the change of day and night on the Earth is explained by the rotation of the Earth around its axis, we mean the frame of reference associated with
1) Sun 2) Earth 3) planets 4) any body
B1-38-KIM2008-06-12
R, making one revolution in time T. How will the physical quantities listed in the first column change if the radius of the circle increases, and the period of revolution remains the same?
A1-59-KIM2008
A stone begins to fall freely from a high sheer cliff. What speed will it have 3 seconds after the start of the fall? Air resistance is negligible.
1) 30 m/s 2) 10 m/s 3) 3 m/s 4) 2 m/s
A2-72-KIM2008
The boat must get to the opposite bank of the river by the shortest path in the reference frame associated with the bank. The speed of the current of the river, and the speed of the boat relative to the water 
. The modulus of the boat's speed relative to the shore should be equal to
1)
2)
3)
4)
A1-46-KIM2008
The car is moving along a straight street. The graph shows the dependence of the car on time. The acceleration modulus is minimal in the time interval
|
from 0 s to 10 s from 10 s to 20 s from 20 s to 30 s from 30 s to 40 s |
v, m/s |
B1-51-KIM2008
The material point moves from constant speed around the circumference of the radius R, rotating with frequency ν. How will the physical quantities listed in the first column change if the radius of the circle decreases, but the frequency of revolution remains the same?
Transfer the resulting sequence to the answer sheet (without spaces or any symbols).
A1-72-KIM2008
x , m 12
The figure shows a graph of the movement of the body. Determine the values of the initial coordinate and velocity of the body. |
4 m, 1.6 m/s 12 m, 0.2 m/s 12 m, 16 m/s |
1 2 3 4 5 t, With |
A1-86-KIM2008
One of the characteristics of the car is the time t of its acceleration from standstill to a speed of 100 km/h. One of the cars has an acceleration time t = 4 s. With what approximate acceleration is the car moving?
1) 4 m/s 2 2) 7 m/s 2 3) 25 m/s 2 4) 111 m/s 2
B2-92-KIM2008
A small stone, thrown from a flat horizontal surface of the Earth at an angle to the horizon, reached a maximum height of 5 m and fell back to the Earth 20 m from the place of the throw. What is equal to minimum speed stone during the flight? Answer: 10 m / s
A1-99-KIM2008
The body moves along the axis OH. Projection of his speed v x ( t ) changes according to the law shown in the graph. The distance traveled by the body in 2 s is
|
v X, m/s |
|
А1-35-ТЗ2007
A car moving at speed v , starts to slow down and in time t its speed is reduced by 2 times. Which way pass the car during this time if the acceleration was constant?
1)
2)
3)
4)
В1-41-ТЗ2007
A ball is thrown upwards from a height of 5.6 m above the ground. After what time after the throw the ball fell to the ground if the top point of its trajectory was at a height of 12.8 m above the ground? Ignore air resistance.
Answer: 2.8 s.
А1-47-ТЗ2007
The speed of a bullet when leaving the barrel of a pistol is 250 m/s. The length of the barrel is 0.1 m. What is the acceleration of the bullet in the barrel, if its movement is considered to be uniformly accelerated?
312.5 km/s 2
С1-54-ТЗ2007
In the last second of the fall, the body traveled a distance twice as long as in the previous second. From what height does the body fall? Construct a graph of the speed of the body as a function of the fall time and indicate on it the paths under consideration.
Answer: 31.25 m.
А1-59-ТЗ2007
The glass tube contains a bird's feather, a cork and a piece of lead. If you use a pump to pump out air from the tube, and turn the tube over, then the bodies will begin to move down. Which of the bodies will reach the bottom of the tube faster?
A piece of lead
All bodies will reach the bottom of the tube at the same time.
bird feather
А1-71-ТЗ2007
When a body moves uniformly in a circle does not remain constant:
line speed
angular velocity
circulation period
circulation frequency.
А1-83-ТЗ2007
The table shows the results of measurements of the path with a free fall of a steel ball in different moments time. What was the most likely value of the path traveled by the ball during the fall, by the time t = 2 s?
|
t , c |
||||||
|
S , m |
1) 10 m 2) 16.25 m 3) 20 m 4) 21.25 m
А2-83-ТЗ2007
A person walks along the raft in the direction of its movement at a speed of 3 km / h. The speed of the water flow is 10 km/h. What is the person's speed relative to the shore?
1) 0.3 km/h 2) 7 km/h 3) 13 km/h 4) 30 km/h
А1-93-ТЗ2007
The movement of the IL-62 aircraft during the takeoff run is given by the equation:
What is the acceleration of the aircraft?
1) 0 2) 0.85 m/s 2 3) 1.7 m/s 2 4) 100 m/s 2
А1-105-ТЗ2007
The movement of a passenger car is given by the equation
What is the initial speed of the car?
1) 0.7 m/s 2) 1.4 m/s 3) 30 m/s 4) 150 m/s
В1-112-ТЗ2007
A body slides on a smooth surface of an inclined plane with acceleration How many times will the acceleration of the body increase when the angle of inclination of the plane is doubled?
А1-117-ТЗ2007
At the beginning of the working day, the taxi entered the route line, and at the end returned to the parking lot. During the working day, the meter reading increased by 400 km. What is displacement s and way l passed by taxi?
1) s = 0; l = 400 km
2) s = 400 km; l = 400 km
3) s = 0; l = 0
4) s = 400 km; l = 0
A1-11-KIM0506
Two cars are moving along a straight road in the same direction, one at 50 km/h and the other at 70 km/h. At the same time they
getting closer
are removed
do not change the distance from each other
may move closer, or they may move away.
B1-17-KIM0506
A small stone, thrown from a flat horizontal surface of the earth at an angle to the horizon, fell to the ground at a distance of 20 m from the place of the throw. What was the speed of the stone 1 second after the throw, if at that moment it was directed horizontally?
B1-27-KIM0506
A small stone thrown from a flat horizontal surface of the earth at an angle to the horizon fell to the ground after 2 seconds at a distance of 20 m from the place of the throw. What is the minimum speed of the stone during the flight?
A1-30-KIM0506
Two cars are moving along a straight road: one at a speed of (-10 m/s), the other at a speed of (-25 m/s). The speed of the second car relative to the first is
1) -35 m/s 2) -15 m/s 3) -20 m/s 4) 35 m/s
A1-51-KIM0506
A cyclist is moving down a hill moving in a straight line and with uniform acceleration. During the descent, the speed of the cyclist increased by 10 m/s. Cyclist acceleration 0.5 m/s 2 . How long did the descent take?
1) 0.05 s 2) 2 s 3) 5 s 4) 20 s
A1-113-KIM0304
K.E. Tsiolkovsky in the book "Out of the Earth", describing the flight of the rocket, noted that 10 seconds after the launch, the rocket was at a distance of 5 km from the Earth's surface. Assuming the motion of the rocket is uniformly accelerated, calculate the acceleration of the rocket.
1) 1000 m/s 2 2) 500 m/s 2 3) 100 m/s 2 4) 50 m/s 2 .
A1-119-KIM0304
A car, moving with uniform acceleration, accelerates to a speed of 100 km/h in 3 s. After what time from the start of acceleration the car had a speed equal to 50 km/h?
1)
s 2) 1.5 s 3) 
4)
A1-126-KIM0304
A motorcyclist and a cyclist simultaneously start moving with uniform acceleration. The acceleration of a motorcyclist is 3 times greater than that of a cyclist. How many times faster will a motorcyclist develop in the same time?
1) 1.5 times 2) B 
times 3) 3 times 4) 9 times.
A1-133-KIM0304
A motorcyclist and a cyclist simultaneously start uniformly accelerated movement from a state of rest. The acceleration of a motorcyclist is 3 times greater than that of a cyclist. How many times longer will it take a cyclist to reach a speed of 50 km/h?
1) B 
2) In times 3) In 3 times 4) In 9 times.
A1-26-KIM0304
The subway escalator rises at a speed of 1 m/s. Can a person on an escalator be at rest in a frame of reference linked to the Earth?
Maybe if it moves in the opposite direction at a speed of 1 m / s.
Maybe if it moves in the same direction with speed. 1 m/s.
Maybe if you're on an escalator.
It cannot under any circumstances.
A2-26-KIM0304
Two cars are moving in the same direction on a straight highway at the same speed. What is the speed of the first car relative to the second?
1) 0 2) 3) 2 4) -
A3-26-KIM0304
The figures show graphs of the dependence of the acceleration module on time for different types of movement. Which graph corresponds to uniform motion?
Answer: 4.
A4-26-KIM0304
The car, starting off, moves with an acceleration of 3 m / s 2. After 4 seconds, the speed of the car will be:
1) 12 m/s 2) 0.75 m/s 3) 48 m/s 4) 6 m/s
A5-26-KIM0304
The dependence of the coordinate on time for some body is described by the equation 
. At what moment is the projection of the body velocity on the axis OH equal to zero?
1) 8 s 2) 4 s 3) 3 s 4) 0.
A6-26-KIM0304
A stone broke off from a high rock and began to fall freely. What speed will it have after 3 seconds from the beginning of the fall?
1) 30 m/s 2) 10 m/s 3) 3 m/s 4) 2 m/s
A1-11-KIM0607
The car, starting off, moves with an acceleration of 4 m / s 2. After 3 seconds, the speed of the car will be:
1) 6 m/s 2) 12 m/s 3) 18 m/s 4) 36 m/s
A1-21-KIM0607
The car starts off and moves uniformly accelerated for 3 seconds. At the same time, its speed reaches 15 m / s. The acceleration of the car is
1) 1.7 m/s2 2) 5 m/s2 3) 10 m/s2 4) 45 m/s2
B1-48-KIM0607
Determine the speed with which a body was thrown from the surface of the earth vertically upwards if, when rising to a height of 40 m from the level of the throw, its speed decreased by 3 times? Ignore air resistance.
A1-31-KIM0607
t 1 and t 2 are not the same
A1-41-KIM0607
The body moves in a straight line along the OX axis in accordance with the graph shown in the figure. At points in time t 1 and t 2 are not the same
A1-51-KIM0607
The body moves in a straight line along the OX axis in accordance with the graph shown in the figure. At points in time t 1 and t 2 are not the same
B1-58-KIM0607
Determine the speed with which the body was thrown vertically downwards, if during the fall of the body by 40 m its speed increased by 3 times. Ignore air resistance.
A1-129-KIM0607
v car from time t.
Find the distance traveled by the car in time from 0 to 1 s.
|
|
B1-136-KIM0607
A body is thrown at an angle of 60° to the horizon with an initial velocity of 24 m/s. What is the speed of this body after 1.6 s? Ignore air resistance. Round your answer to the nearest integer.
B1-157-KIM0607
For 2 s of rectilinear motion with constant acceleration, the body increases its speed by 3 times. How long did the body move from rest to the beginning of this interval?
Answer: 1 s
S1-159-KIM0607
A ball thrown at an angle of 45° to the horizon from a distance S = 6.4 m from the fence flew over it, touching it at the top of the trajectory. What is the height of the fence above the level from which the ball was thrown?
B1-169-KIM0607
For 2 s of rectilinear motion with constant acceleration, the body traveled a distance of 20 m, increasing its speed by 3 times. Determine the path that the body has traveled before the beginning of this interval, moving from a state of rest.
Answer: 2.5?
S1-170-KIM0607
A ball thrown from a certain distance S from the fence flew over it, touching it at the highest point of the trajectory, where the ball's speed was 8 m/s. What is the distance S if the height of the fence above the level from which the ball was thrown is h = 3.2 m?
B1-169-KIM0607
The initial velocity of a body thrown at an angle to the horizon is 26 m/s. At the top of the trajectory, the velocity of this body is 10 m/s. How long did it take the body to rise from the starting point to the top point of the trajectory? Ignore air resistance. Round your answer to tenths.
B1-169-KIM0607
The initial velocity of a body thrown at an angle to the horizon is 26 m/s. The body rose from the starting point to the top point of the trajectory within 2.4 s. What is the speed of this body at the top of the trajectory? Ignore air resistance. Round your answer to the nearest integer.
A1-173-KIM0607
The figure shows a graph of the speed modulus v car from time t. Determine from the graph the path traveled by the car in the time interval from 0 to 1 s after the start of movement.
A1-193-KIM0607
A body is thrown vertically upwards with an initial velocity of 10 m/s. If air resistance is neglected, then one second after the throw, the speed of the body will be equal to
1) 15 m/s 2) 10 m/s 3) 5 m/s 4) 0
A29-159-KIM2002
In a rectilinear uniformly accelerated motion with an initial speed equal to zero, the path traveled by the body in two seconds from the start of motion is greater than the path traveled in the first second, in
1) 2 times 2) 3 times 3) 4 times 4) 5 times
A28-167-KIM2002
A slope 50 m long was covered by a skier in 10 s, moving with an acceleration of 0.2 s 2 . What is the speed of the skier at the beginning and end of the slope?
3 m/s and 6 m/s 3) 2 m/s and 8 m/s
5 m/s and 7 m/s 4) 4 m/s and 6 m/s
A1-172-KIM2002
The figure shows a graph of coordinates versus time. In what time interval was the body's velocity zero?
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A1-181-KIM2002
The body coordinate changes over time according to the formula 
. What is the coordinate of this body 5 s after the start of motion?
1) - 15m 2) - 10m 3) 10m 4) 15m
A1-190-KIM2002
When a body falls freely from rest, its speed increases by
1) 10 m/s 2) 5 m/s 3) 0 m/s 4) 20 m/s
A1-199-KIM2002
In the tube from which the air is pumped out, at the same height there are a pellet, a cork and a bird's feather. Which of these bodies will be the last to reach the bottom of the tube when they fall freely from the same height?
Bird feather.
All three bodies will reach the bottom of the tube at the same time.
Pellet.
А2-129-FIPI2007
Two material points move along circles with radii R 1 and R 2 = 2R 1 with the same absolute speeds. Their periods of revolution in circles are related by the relation
1)
2)
3)
4)
B1-137-FIPI2007
Two gears coupled to each other rotate around fixed axes (see Fig.). A large gear with a radius of 20 cm makes 20 revolutions in 10 seconds. How many revolutions per second does a gear with a radius of 10 cm make?
A1-145-FIPI2007
The figure shows a path dependence graph S from time t. Determine the time interval after the start of the movement, when the cyclist was moving at a speed of 5 m/s.
А2-179-FIPI2007
Two material points move along circles with radii R 1 and R 2, and R 2 = 2R 1.
Under the condition that the linear velocities of the points are equal, their centripetal accelerations are related by the relation
1)
2)
3)
4)
3(B, VO)-16-FIPI2007
Two tasks are solved:
a) calculate the docking maneuver of two spacecraft;
b) the period of revolution of spaceships around the Earth is calculated.
In which case spaceships can be considered as material points?
only in the first case
only in the second case
in both cases
not in the first. not in the second case.
4(P, VO)-16-FIPI2007
What is the displacement of a material point in 5 s, the movement of which along the OX axis is described by the equation: 
?
5 m 2) 11 m 3) 13 m 4) 18 m
5(P, VO)-16-FIPI2007
According to the graph of the dependence of the velocity modulus on time (see figure), determine the path traveled by the body in 2 s.
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6(B, VO)-17-FIPI2007
The figure shows a graph of the dependence of the coordinates of a body moving along the OX axis on time. Compare the speeds v 1 , v 2 and v 3 of the body at times t 1 ,t 2 ,t 3 .
8(P, K)-17-FIPI2007
For 2 s of rectilinear motion with constant acceleration, the body increases its speed by 3 times and travels a distance of 20 m. Determine the initial speed of the body.
9(B, VO)-17-FIPI2007
According to the graph of the dependence of the velocity modulus on time, shown in the figure, determine the acceleration of a rectilinearly moving body at the time t = 2 s.
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10(P, VO)-18-FIPI2007
The equation for the projection of the speed of a moving body on time: 
What is the corresponding equation for the projection of the displacement of the body?
1)
3)
2)
4)
12(P, K)-18-FIPI2007
What is the distance traveled by a freely falling body in 6 seconds? v 0 \u003d 0 m / s, the acceleration of free fall is taken equal to 10 m / s 2.
14(P, R)-18-FIPI2007
A steel ball falls freely from a height H = 30 m. After t = 2 s after the start of the fall, it collides with a fixed plate, the plane of which is inclined at an angle of 30° to the horizon. To what height h above the Earth's surface will the ball rise after the impact?
Answer: 15 m.
2-154-FIPI2007
A steel ball falls freely from a height H = 30 m. When falling, it collides with a fixed plate, the plane of which is inclined at an angle of 30 ° to the horizon and takes off to a height of 15 m above the Earth's surface. What is the time it takes for the ball to fall before hitting the plate?
Answer: 2 s.
A1-163-FIPI2007
The figure shows graphs of the projections of the velocities of four bodies on the OX axis as a function of time. The greatest movement in 3 seconds will be made by
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A1-203-FIPI2007
A cyclist is moving down a hill moving in a straight line and with uniform acceleration. During the descent, the speed of the cyclist increased by 10 m/s. The acceleration of the cyclist is 0.5 m/s2. How long is the descent?
1) 0.05 s 2) 2 s 3) 5 s 4) 20 s
A1-7-FCT (entry tests)
A truck and a motorcyclist are driving along a ring road with length L=5 km in the same direction at speeds v 1 = 40 km/h and v 2 = 100 km/h, respectively. If at the initial moment of time they were in the same place, then the motorcyclist will catch up with the car, passing
1) 6.2 km 2) 8.3 km 3) 12.5 km 4) 16.6 km 5) 20 km
A1-178-FIPI2007
The figure shows a graph of acceleration versus time. Indicate during what period of time the motion of the body was uniformly accelerated.
V v O is equal to
1) 11 m/s 2) 12 m/s 3) 14 m/s 4) 16 m/s 5) 18 m/s
A1-23-FCT2007
Two cars are moving along mutually perpendicular roads. The modulus of the speed of the first relative to the road is v, and the modulus of the speed of the second relative to the first is 
. In this case, the modulus of the speed of the second car relative to the road is equal to
1)
2)
3) v 4) 2v
B1-28-FCT2007
A small stone, thrown from a flat horizontal surface at an angle to the horizon, fell back to the ground 20 m from the place of the throw. How long will it take for the stone to reach a height of 15 m? The minimum stone speed is 5 m/s.
A1-33-FCT2007
Two cars are moving along a straight highway: the first one at a speed and the second one at a speed 
. The speed of the first car relative to the second is
1)
2)
3)
4)
B1-38-FCT2007
A small stone thrown from a flat horizontal surface at an angle to the horizon, after 1 second, was at a height of 15 m. Determine the maximum flight range of the stone. The minimum stone speed is 5 m/s.
A1-42-FCT2007
A swimmer swims across a river using the shortest path. The swimmer's speed relative to the water is 5 km/h. The speed of the river is 3 km/h. The swimmer's speed relative to the shore is
1) 2 km/h 2) 3 km/h 3) 4 km/h 4) 8 km/h
B1-48-FCT2007
A small stone, thrown from a flat horizontal surface at an angle to the horizon, fell back to the ground 20 m from the place of the throw. At what angle to the horizon will the stone's velocity be directed 1.5 s after the throw? The minimum stone speed is 5 m/s.
A1-52-FCT2007
The boat, moving along the river, passes 2 km downstream, turns around (instantly) and returns to the point of departure. The speed of the boat over the water is 36 km/h, the speed of the river is 4 km/h. The total time the boat moves back and forth is .... (Give the answer in minutes.
1) 4 min. 2) 6.8 min 3) 12.5 min 4) 21.1 min
A1-63-FCT2007
An airplane flies from city A to city B at a speed v relative to the air. On the flight path with speed u the wind is blowing, the direction of which is perpendicular to the segment connecting these cities. Determine the modulus of the aircraft's speed relative to the ground.
1)
2)
3)
4)
A1-73-FCT2007
Two tasks are solved:
calculate the path traveled by the Earth in orbit around the Sun in a year;
Calculate the length of the Earth's equator.
can be taken as a material point in the first case
can be taken as a material point in the second case
can be taken as a material point in both cases
cannot be taken as a material point either in the first or in the second cases.
A1-83-FCT2007
The trajectory of the wheel rim point relative to the center of the wheel when the vehicle is moving is
sinusoid.
circle
helix
A1-103-FCT2007
The trolley moves along the OX axis. The figure shows a graph of the dependence of the coordinate X carts from time t . During what period of time did the cart move at a constant speed?
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Physics test Laws of motion of bodies Grade 9 with answers. The test includes 2 options. Each version has 3 parts. In part A - 6 tasks, in part B - 2 tasks, in part C - 2 tasks.
Option 1
A1. The subway escalator rises at a speed of 1 m/s. Can a person on an escalator be at rest in a frame of reference linked to the Earth?
1) can, if it moves against the movement of the escalator at a speed of 1 m / s
2) it can if it moves in the direction of the escalator at a speed of 1 m/s
3) maybe if standing on an escalator
4) cannot under any circumstances
A2. One of the characteristics of a car is time
t of its acceleration from standstill to a speed of 100 km / h. Two cars have such an acceleration time that t 1 \u003d 2t 2. The acceleration of the first car relative to the acceleration of the second car:
1) less than 2 times
2) √2 times more
3) more than 2 times
4) 4 times more
A3. The coordinate of the body changes over time according to the formula x = 5 - 3t, where all quantities are expressed in SI units. What is the coordinate of this body 5 s after the start of motion?
1) -15 m
2) -10 m
3) 10 m
4) 15 m
A4. The dependence of the path on time for a rectilinearly moving body has the form: S(t) = 2t + 3t 2 , where all quantities
expressed 2 in SI units. The acceleration of the body is:
1) 1 m/s 2
2) 2 m/s 2
3) 3 m/s 2
4) 6 m/s 2
A5. With rectilinear uniformly accelerated motion with zero initial speed, the path traveled by the body in 2 s from the beginning of the movement is greater than the path traveled in the first second:
1) 2 times
2) 3 times
3) 4 times
4) 5 times
B1. Leopold the cat rides a bicycle past a sign that reads "7 km to the city" and after a while past the second post - "5 km to the city". What is the change in Leopold's coordinates?
AT 2. The stork flew 3 km to the north, turned to the east
and flew another 4 km. Find the length of the vector connecting its start and end positions.
C1. At some point in time, the coordinate of the tractor
in the chosen reference system is 30 km. Its speed is directed against the direction of the axis and is equal to 20 km/h. What will be the coordinate of the tractor after two hours of movement?
C2. A motorboat going up against the river met rafts rafting down the river. An hour after the meeting, the outboard motor stalled. The repair of the motor lasted 30 minutes, and all this time the boat floated freely downstream. After the repair, the boat swam downstream at the same speed relative to the water and caught up with the rafts at a distance of 7.5 km from the place of their first meeting. Determine the speed of the river.
Option 2
A1. Two cars are moving along a straight road in the same direction, one at 50 km/h and the other at 70 km/h. At the same time, cars:
1) get closer
2) are removed
3) travel at a constant distance from each other
4) can approach, or can move away
A2. The car, starting off, moves with an acceleration of 3 m / s 2. After 4 seconds, the speed of the car will be:
1) 12 m/s
2) 0.75 m/s
3) 48 m/s
4) 6 m/s
A3. A motorcyclist and a cyclist simultaneously start uniformly accelerated movement from a state of rest. The acceleration of a motorcyclist is 3 times greater than that of a cyclist. How many times longer will it take a cyclist to reach a speed of 50 km/h?
1) 1/3 times
2) √3 times
3) 3 times
4) 9 times
A4. The dependence of the coordinate of some body on time is described by the equation x = 8t - t 2, where all quantities are expressed in SI units. At what point in time is the body's velocity zero?
1) 8 s
2) 4 s
3) 3 s
4) 0 s
A5. The arrow is launched vertically upwards. The projection of its velocity on the vertical direction changes over time in accordance with the graph. (See picture.)
At what point in time did the arrow reach its maximum height?
1) 1.5 s
2) 3 s
3) 4.5 s
4) 6 s
IN 1. Winnie the Pooh rises on a balloon to the hollow, but at a height of 10 m the balloon bursts and Pooh falls to the ground. What is the change in Pooh's coordinates?
AT 2. Robin Hood fired his bow at an angle of 60° to the horizon. The arrow at the moment of the beginning of the movement had a speed of 40 m/s. Find the projection of the arrow speed on the horizontal axis.
C1. At some point in time, the coordinate of the car in the chosen reference system was 120 km, after 2 hours of its movement, the coordinate was 10 km. Find the projection of the speed of this car on the axle.
C2. Two trains left Moscow for Pushkino with a time interval t equal to 10 minutes with a speed v 1 = 30 km/h. With what speed v 2 did the train going to Moscow move if it met these trains 4 minutes after each other?
Answers to the test in physics Laws of motion of bodies Grade 9
Option 1
A1-1
A2-1
A3-2
A4-4
A5-3
IN 1. -2 km
AT 2. 5 km
C1. -10 km
C2. 3 km/h
Option 2
A1-4
A2-1
A3-3
A4-2
A5-2
IN 1. 0
AT 2. 20 m/s
C1. -55 km/h
C2. 45 km/h
