O-LevelPhysicsKinematics5054/22 · May/June 2021 · Q26 Marks
A car approaches a set of traffic lights. The lights change to red at time t = 0. Fig. 2.1 shows how the speed of the car changes with time. [Figure 2.1]
- (a)The car starts to slow down a short time after the lights change to red. Determine the time between the lights changing to red and the car starting to slow down.[1]
- (b)(i)State what is meant by uniform acceleration.[1]
- (b)(ii)State how Fig. 2.1 shows that the deceleration of the car between t = 2s and t = 7s is non-uniform.[1]
- (c)Determine the distance the car travels from the moment the car starts to slow down until it stops. distance =[3]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.
- [B1] 1.4 s
- [B1] same change in speed/ velocity in the same time
- [B1] slope / gradient changes
- [C1] any clear statement or any use of area under graph or d = s × t or an (average) speed × time
- [C1] calculation of any area between 1.4 and 7.0 s on Fig.2.1 e.g. 14 x 2.6; 36.4; 4 × 3; 12; ½ × 12 × 2.6; 15.6; 2.6 × 8; 20.8 (m) seen
- [A1] 48 m
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