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1.5 Forces

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Question 82

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?

A

The resultant force is zero and the resultant moment is zero.

B

The resultant force is 100 N100\text{ N}100 N and the resultant moment is zero.

C

The sum of the downward forces is zero and the resultant moment is zero.

D

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.

Markscheme

1.5 Forces Questions

  1. IGCSE
  2. /Physics
  3. /1.5 Forces

245 exam-style questions on CIE IGCSE Physics 1.5 Forces, covering 1.5.1a Forces, resultant force and motion, 1.5.1b Load–extension graphs and the spring constant, 1.5.1c Friction and drag, 1.5.1d Force, mass and acceleration, 1.5.1e Motion in a circular path, 1.5.2a Moment of a force, 1.5.2b Principle of moments and equilibrium, and 1.5.3 Centre of gravity and stability. Each one has a worked solution and a mark scheme showing where the marks go.

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