GCSE Perfect
Show — 2 marks
A cyclist is travelling at 8 m/s on a level road when they see a pedestrian ahead. They apply the brakes, which exert a constant friction force of 120 N on the bicycle and rider (total mass 80 kg).
- Show that the deceleration of the cyclist is 1.5 m/s². [2 marks]
Show mark scheme
- {'mark': 1, 'description': 'Correct use of F = ma rearranged to a = F/m, or states a = 120/80'}
- {'mark': 1, 'description': 'Correct calculation to reach a = 1.5 m/s² (allow 1.5 or 1.50)'}