What this practice covers
These questions are drawn from past CIE 9702 Physics papers and filtered to dynamics. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on dynamics, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Naming the weight of a book and the table's normal contact force as a third-law pair.
- Saying the third-law forces cancel out. They act on different bodies.
- Adding magnitudes instead of using signed velocities when a body rebounds.
- Saying momentum is not conserved in an inelastic collision. It always is.
- Treating kinetic energy as conserved when two bodies stick together.
- Confusing mass and weight, particularly in a question about a different planet.
- Using F = ma when the mass is changing; the momentum form is needed.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Dynamics revision notes.