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?
830 N
7500 N
8300 N
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?
5.43 m s−1
11.2 m s−1
12.8 m s−1
14.4 m s−1
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Question 3
What is true for an inelastic collision between two isolated objects?
both total momentum and total kinetic energy are conserved
neither total momentum nor total kinetic energy is conserved
only total kinetic energy is conserved
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?
X and Y have the same initial momentum
X and Y reach their maximum heights at different times
the maximum height reached by Y is half that reached by X
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
kinetic energy
mass
gravitational potential energy
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?
the time of the impact
the weight of the hockey stick
the impulse of the force
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?
1.5 m s−1
3.8 m s−1
12.5 m s−1
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?
24 kg m s−2
30 kg m s−2
100 kg m s−2
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?
2.0 kg m s−1
2.5 kg m s−1
4.5 kg m s−1
6.5 kg m s−1
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