An astronaut takes an object of mass 2.0 kg from the Earth to the Moon.
The gravitational field strength on the Earth is 10 N/kg. The gravitational field strength on the Moon is 1.6 N/kg.
The object is hung from a newton meter on the Earth and then on the Moon.
Calculate the difference between the two readings.
A top-pan balance works by measuring the force of the object on its pan. It was set up on the Earth to display the mass in kg\text{kg}kg.
The object is placed on this balance on the Moon.
Explain what reading the balance shows.
Two students, each of mass 50 kg, stand next to each other.
Explain why they do not notice any gravitational attraction between them.
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.