A scientific probe on the planet Mars has a mass of 150 kg and a weight of 555 N.
What is the gravitational field strength on Mars?
0.27 N/kg0.27\text{ N/kg}0.27 N/kg
3.7 N/kg3.7\text{ N/kg}3.7 N/kg
405 N/kg405\text{ N/kg}405 N/kg
83 250 N/kg83\,250\text{ N/kg}83250 N/kg
39 exam-style questions on OCR GCSE Physics Forces in action. Each one has a worked solution and a mark scheme showing where the marks go.