O-LevelPhysicsKinematics5054/22 · May/June 2016 · Q15 Marks
Fig. 1.1 shows the speed-time graph for a car travelling along a horizontal road.
- (a)On Fig. 1.1, mark and label a point where the car has a non-uniform deceleration.[1]
- (b)Calculate the deceleration of the car at t = 3.0 s.[2]
- (c)Explain, in terms of the horizontal forces that act on the car, why its speed is constant at t = 1.0s.[2]
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 2016). The mark or mark type is shown in brackets.
- [1] mark at a time between 4.0 and 7.5 seconds
- [1] (a =) (v – u)/t numerical or algebraic
- [1] or (a =) gradient of graph stated
- [1] 2.5 m/s²
- [1] forward force and backward force clear
- [1] equal forces (in horizontal direction) or no resultant force or forces cancel/balance/in equilibrium
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