P2 3
Exam-style questions
Name:
Class:
Work energy and momentum
1
The picture shows a catapult.
(a) When a force is applied to the stone, work is done in stretching the elastic and the stone
moves backwards.
(i) Write down the equation you could use to calculate the work done.
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(1)
(ii) The average force applied to the stone is 20 N. This moves it backwards 0.15 m.
Calculate the work done and give its unit.
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(3)
(b) The work done is stored as energy.
(i) What type of energy is stored in the stretched elastic?
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(1)
(ii) What type of energy does the stone have when it is released?
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2
(1)
(a) The diagram shows three cars, A, B and C, travelling along a straight, level road at 25 m/s.
(i) Explain which vehicle, A, B or C has the greatest momentum.
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AQA Science © Nelson Thornes Ltd 2006
P2 3
(2)
1
P2 3
Exam-style questions
Continued …
(ii) Would you need a more sensitive weighing device to be more certain of your answer to
part (i)? Give your reasoning.
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(2)
(b) The diagram shows three identical cars, D, E and F, all of mass 1500 kg, travelling along a
straight, level road at different speeds.
Explain which vehicle, D, E or F has the greatest momentum.
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(2)
(c) Calculate the momentum of car E, include the unit with your answer.
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3
(4)
A student is doing an investigation of the conservation of momentum with a horizontal air track
and two ‘gliders’.
(a) Explain what is meant by conservation of momentum.
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(2)
(b) Apart from collisions, give another type of event in which conservation of momentum applies.
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AQA Science © Nelson Thornes Ltd 2006
P2 3
(1)
2
P2 3
Exam-style questions
Continued …
(c) The diagram shows the air track and the two ‘gliders’, X and Y.
The mass of X is 0.2 kg and its velocity is 1.5 m/s to the right.
The mass of Y is 0.3 kg and it is stationary. When ‘glider’ X collides with trolley Y they move off
together.
Calculate the velocity of the ‘gliders’ after the collision and give their direction.
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AQA Science © Nelson Thornes Ltd 2006
P2 3
(4)
3