Physics (AS & A Level) · May / June 2017 · Paper 13 · Question 7
9702Momentum and Newton’s laws of motion
A driver stops his car in time t by gradually increasing the total braking force on the car. The graph shows the resultant force on the car. [graph: force against time, straight line through origin increasing to time t] Which graph shows how the speed of the car will vary during this time?
- Aspeed-time graph: speed decreasing with decreasing gradient (concave up curve) from initial speed to zero at time t
- Bspeed-time graph: speed decreasing linearly (straight line) from initial speed to zero at time t
- Cspeed-time graph: speed decreasing with an S-shaped curve from initial speed to zero at time t
- Dspeed-time graph: speed decreasing with increasing gradient (concave down curve) from initial speed to zero at time t
As printed in the paper
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Correct answer: D. speed-time graph: speed decreasing with increasing gradient (concave down curve) from initial speed to zero at time t
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