A remotely operated research vehicle of mass 1000 kg is tested on a straight, level track. The horizontal forces during three stages of the test are shown in the table.
| Stage | Situation | Driving force forwards in N\text{N}N | Resistive force backwards in N\text{N}N |
|---|---|---|---|
| 1 | the vehicle starts from rest | 2000 | 500 |
| 2 | the vehicle moves forwards | 1000 | 1000 |
| 3 | the vehicle moves forwards with its motor switched off | 0 | 1000 |
The test is repeated with an instrument package of mass 500 kg attached to the vehicle. The force values in stage 1 remain unchanged.
Explain how the forces affect the motion of the vehicle in each of the three stages. Predict how carrying the instrument package affects the vehicle's acceleration in stage 1.
Your answer should use both Newton's first law and Newton's second law, and should include calculations.
103 exam-style questions on Edexcel GCSE Physics 2.3 Forces and Newton's laws, covering 2.3.1 Newton's first law, 2.3.2 Newton's second law, and 2.3.3 Weight and gravitational field strength. Each one has a worked solution and a mark scheme showing where the marks go.