An astronaut has a mass of 80 kg.
The gravitational field strength on the Earth is 10 N/kg.
Define the term weight.
Name the piece of apparatus used to measure weight.
Use the equation: weight=mass×gravitational field strength\text{weight} = \text{mass} \times \text{gravitational field strength}weight=mass×gravitational field strength
Calculate the weight of the astronaut on the Earth.
The gravitational field strength on the Moon is 1.6 N/kg.
State the mass of the astronaut on the Moon and calculate his weight on the Moon.
Suggest why the gravitational field strength on the Moon is smaller than on the Earth.
46 exam-style questions on OCR GCSE Physics 2.3 Forces in action, covering 2.3.1 Stretching, bending and compressing, 2.3.2 Elastic and plastic deformation, 2.3.3 Force and extension of a spring, 2.3.4 Linear and non-linear force-extension behaviour, 2.3.5 The spring constant, 2.3.6 Work done in stretching, 2.3.7 Gravitational fields, 2.3.8 Weight and gravitational field strength, 2.3.9 Acceleration in free fall, 2.3.10 Relating force, mass and gravitational field strength, 2.3.11 Forces causing rotation, 2.3.12 The moment of a force, 2.3.13 Levers and gears, 2.3.14 Pressure in fluids, and 2.3.15 Pressure, force and contact area. Each one has a worked solution and a mark scheme showing where the marks go.