Quick questions on Momentum, impulse and conservation in collisions (QCE Physics Unit 2)

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?

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Define linear momentum and impulse, and state their SI units. [2 marks]

What is q2?

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0.15 \text{ kg}

cricket ball travelling at

30 \text{ m s}^{-1}

is struck and returns at

40 \text{ m s}^{-1}

in the opposite direction. Contact time is

2.0 \text{ ms}

. Calculate the impulse and the average force.

What is q3?

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A Cairns tram (

30000 \text{ kg}

) at

8.0 \text{ m s}^{-1}

couples with a stationary trailer (

15000 \text{ kg}

). (a) Calculate the joint velocity post-coupling. (b) Determine the kinetic energy before and after, and the energy dissipated.

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