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1.5 Forces

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Question 35
a.

Define what is meant by the moment of a force about a pivot.

[1]
b.

A uniform wooden bar balances horizontally on a small cylinder, which acts as a pivot.

A block is placed on the left end of the bar, and a student pulls down vertically on the right end to keep the bar horizontal.

What two things can be said about the moments acting on the bar due to the block and due to the student's pull?

  1. ____________________________________

  2. ____________________________________

[2]
c.

When the bar is in equilibrium, there are four forces acting on it. Three of these forces are:

  • the weight of the block
  • the weight of the bar
  • the downward pulling force exerted by the student

  1. Where does the fourth force act on the bar?

  2. What is the direction of this fourth force?

[2]
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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