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Two roller skaters are moving towards each other on a flat, low-friction rink. They collide and then move off together.

Figure showing two roller skaters, Skater A and Skater B, skating towards each other before a collision. Skater A is on the left with an arrow pointing to the right; below Skater A, the text states "Mass = 60 kg" and "Velocity = +5.5 m/s". Skater B is on the right with an arrow pointing to the left; below Skater B, the text states "Mass = 90 kg" and "Velocity = -3.0 m/s".

During the collision, the total momentum of the skaters is conserved.

a.

What is meant by the phrase 'momentum is conserved'?

[2]
b.

Immediately after the collision, the two skaters move together. Calculate the velocity of the two skaters immediately after the collision.

[3]
c.

The skaters wear protective elbow pads containing cushioning gel. Explain how these protective pads help to reduce injury when the skaters collide.

[3]

Momentum (HT only) Questions

Practise AQA GCSE Physics Momentum (HT only) with exam-style questions for Foundation and Higher tier. 9 questions covering Momentum is a property of moving objects, Conservation of momentum, and Changes in momentum (physics only), matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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Momentum (HT only) Questions

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