In two trials, the emergency brake on an automated parcel shuttle brings the shuttle to rest over the same distance. The speed at the start of the second trial is half the speed at the start of the first trial. The braking force is constant during each trial.
How does the braking force in the second trial compare with the braking force in the first trial?
It is one quarter as great, because one quarter of the kinetic energy is transferred over the same distance.
It is one sixteenth as great, because the halving effect must be squared once for energy and again for force.
It is unchanged, because the shuttle travels the same distance while braking.
It is four times as great, because a smaller energy transfer requires a larger braking force.
113 exam-style questions on AQA GCSE Physics 5.2 Work done and energy transfer, covering 5.2 Work done and energy transfer. Each one has a worked solution and a mark scheme showing where the marks go.