A lorry is travelling along a road at 54 km/h.
Show that 54 km/h is equal to 15 m/s.
The lorry driver has a reaction time of 0.80 s.
Use the equation: distance=speed×time\text{distance} = \text{speed} \times \text{time}distance=speed×time
Calculate the thinking distance of the lorry.
On a longer journey, the lorry travels 180 km in 2.5 hours.
Calculate the average speed of the lorry in m/s\text{m/s}m/s.
Explain why the speed of the lorry at one moment during this journey can be different from its average speed.
50 exam-style questions on OCR GCSE Physics 8.1 Physics on the move, covering 8.1.1 Typical everyday speeds, 8.1.2 Typical everyday accelerations, 8.1.3 Ratios, units and rates on the road, 8.1.4 Human reaction times, 8.1.5 Factors affecting stopping distance, 8.1.6 Stopping distances at different speeds, 8.1.7 Dangers of large decelerations, 8.1.8 Estimating forces in road situations, and 8.1.9 Estimating the effects of large accelerations. Each one has a worked solution and a mark scheme showing where the marks go.