A playground roundabout turns about a pivot at its centre.
A child pushes the roundabout with a force of 30 N. The force acts at right angles to the radius of the roundabout. The child applies the force 80 cm from the centre.
Use the equation
moment of a force=force×distance normal to the direction of the force\text{moment of a force} = \text{force} \times \text{distance normal to the direction of the force}moment of a force=force×distance normal to the direction of the force
Give the distance from the centre in metres.
Calculate the moment of the force about the centre of the roundabout.
The child applies the same force at a point further from the centre.
State how this changes the moment of the force.
102 exam-style questions on Edexcel GCSE Physics 9.2 Moments, covering 9.2.1 Rotational effects of forces and moments, 9.2.2 The principle of moments, and 9.2.3 Levers and gears. Each one has a worked solution and a mark scheme showing where the marks go.