Three children, X, Y and Z, play on a seesaw. The seesaw is pivoted at its centre.
Child X has a weight of 300 N and sits 2.0 m to the left of the pivot.
Child Y has a weight of 200 N and sits 1.0 m to the left of the pivot.
Child Z has a weight of 400 N and sits to the right of the pivot.
The seesaw is balanced and horizontal.
Calculate the total anticlockwise moment about the pivot.
Calculate the distance between child Z and the pivot.
Child Y moves to sit directly above the pivot. Child X and child Z do not move.
Explain what happens to the seesaw.
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.