Two students, Alan and Betty, are sitting on opposite sides of a seesaw. Alan has a weight of 350 N and Betty has a weight of 450 N. The seesaw is in equilibrium.
Which statement correctly describes why the seesaw is in equilibrium?
The resultant force is zero and the resultant moment is zero.
The resultant force is 100 N100\text{ N}100 N and the resultant moment is zero.
The sum of the downward forces is zero and the resultant moment is zero.
The total downward force is 800 N800\text{ N}800 N and the resultant moment is 100 N⋅m100\text{ N}\cdot\text{m}100 N⋅m.
43 exam-style questions on CIE IGCSE Physics 1.5.2a Moment of a force. Each one has a worked solution and a mark scheme showing where the marks go.