An event recorder stores information about an emergency stop made by a forklift truck. When the operator notices an obstruction, the truck is moving at 5.0 m/s. The brakes begin to act after a delay. The truck has a mass of 2400 kg and travels a total distance of 13 m between the operator noticing the obstruction and the truck coming to rest.
The speed decreases at a constant rate while the brakes act.
| time after braking begins in s\mathrm{s}s | speed in m/s\mathrm{m/s}m/s |
|---|---|
| 0.0 | 5.0 |
| 4.0 | 0.0 |
What are the operator's reaction time and the magnitude of the resultant force on the truck while the brakes act?
0.60 s0.60\ \mathrm{s}0.60 s and 3000 N3000\ \mathrm{N}3000 N
2.6 s2.6\ \mathrm{s}2.6 s and 3000 N3000\ \mathrm{N}3000 N
2.6 s2.6\ \mathrm{s}2.6 s and 6000 N6000\ \mathrm{N}6000 N
0.60 s0.60\ \mathrm{s}0.60 s and 6000 N6000\ \mathrm{N}6000 N
126 exam-style questions on Edexcel GCSE Physics 2.5 Stopping and braking distances, covering 2.5.1 Stopping distance and reaction time, 2.5.2 Factors affecting stopping distance, 2.5.3 Dangers of large decelerations, and 2.5.4 Braking distance and initial speed. Each one has a worked solution and a mark scheme showing where the marks go.