Download Test on Newton`s Laws and Momentum - science

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PLYMSTOCK
PHYSICS
DEPARTMENT
G484.1 Newton’s Laws
and
Momentum Test
Question 1 Newton’s Laws and Change in Momentum
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Question 2 Change in Momentum
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Question 3 Newton’s Laws and Change in Momentum
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Question 4 Conservation of Momentum and Impulse
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This question is about an alpha particle making a head on collision with a gold nucleus.
(a) (i) When the alpha particle is at a large distance from the gold nucleus it has a
kinetic energy of 7.6 10–13 J. Show that its speed is about 1.5 107 m s–1.
mass of alpha = 6.6 x 10–27 kg.
[2]
(ii) As the alpha particle approaches the gold nucleus, it slows down and the gold nucleus
starts to move.
Explain this and explain how it is possible to calculate the speed of the gold nucleus.
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(iii) Fig.1.2 shows the alpha particle and the gold nucleus at the distance of closest
approach. At this instant the gold nucleus is moving with speed V and the alpha particle
is stationary.
Calculate the speed V of the gold nucleus.
mass of gold nucleus = 3.0 x 10–25 kg
V = ......................m s–1 [2]
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