Question 1

In a test a 500 kg car travelling at 10 m s–1 hits a wall. The front 0.30 m of the car crumples as the car is brought to rest.

What is the average force on the car during the impact?

  A  

830 N


  B  

7500 N


  C  

8300 N


  D  

83 000 N


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Question 2

A car of mass 580 kg collides with the rear of a stationary van of mass 1200 kg.

Following the collision, the van moves with a velocity of 6.20 m s−1 and the car recoils in the opposite direction with a velocity of 1.60 m s−1.

What is the initial speed of the car?

  A  

5.43 m s−1

  B  

11.2 m s−1

  C  

12.8 m s−1

  D  

14.4 m s−1

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Question 3

What is true for an inelastic collision between two isolated objects?


  A  

both total momentum and total kinetic energy are conserved

  B  

neither total momentum nor total kinetic energy is conserved

  C  

only total kinetic energy is conserved

  D  

only total momentum is conserved

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Question 4

Two ball bearings X and Y are projected from horizontal ground at the same time.

X has mass 2m and is projected vertically upwards with speed u.

Y has mass m and is projected at 30° to the horizontal with speed 2u.

Air resistance is negligible.

Which statement is correct?

  A  

X and Y have the same initial momentum

  B  

X and Y reach their maximum heights at different times

  C  

the maximum height reached by Y is half that reached by X

  D  

X and Y reach the ground at the same time

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Question 5

A body of constant mass falls freely due to gravity.

The rate of change of momentum of the body is equal to its

  A  

kinetic energy


  B  

mass

  C  

gravitational potential energy


  D  

weight

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Question 6

A ball, initially at rest, is struck by a hockey stick. It leaves the hockey stick at speed v.

Which quantity, together with the mass of the ball, can be used to determine v?

  A  

the time of the impact

  B  

the weight of the hockey stick

  C  

the impulse of the force

  D  

the final momentum of the hockey stick

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Question 7

A puck of mass 0.16 kg is sliding on ice with a constant velocity of 11.0 m s−1. A hockey stick exerts a force on the puck, for a short period of time, in the opposite direction to the velocity of the puck.

The momentum of the puck changes by 2.0 kg m s−1.

Ignore friction.

What is the speed of the puck when it leaves the hockey stick?

  A  

1.5 m s−1

  B  

3.8 m s−1

  C  

12.5 m s−1

  D  

23.5 m s−1

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Question 8

A javelin thrower exerts a force of 100 N on a javelin for a time of 0.30 s.

The javelin has a mass of 0.80 kg.

What is the rate of change of the momentum of the javelin?

  A  

24 kg m s−2

  B  

30 kg m s−2

  C  

100 kg m s−2

  D  

125 kg m s−2

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Question 9

A trolley of mass 1.0 kg is moving on a horizontal surface at a constant velocity of 2.0 m s−1. A force of 3.0 N is applied to the trolley in the opposite direction to its motion for a time of 1.5 s and then the force is removed.

What is the magnitude of the final momentum of the trolley?

  A  

2.0 kg m s−1

  B  

2.5 kg m s−1

  C  

4.5 kg m s−1

  D  

6.5 kg m s−1

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