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1.5 Forces

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Question 46

A uniform horizontal rod of length L L\,L is pivoted at its center, allowing it to rotate freely in a horizontal plane. Two forces, each of magnitude FFF, are applied horizontally and perpendicular to the rod in one of four different arrangements:

  • Arrangement A: The forces are applied at opposite ends of the rod, acting in opposite directions so that both tend to rotate the rod in a clockwise direction.
  • Arrangement B: One force is applied at one end of the rod, and the other force is applied at the pivot.
  • Arrangement C: One force is applied at one end of the rod, and the second force is applied halfway between the pivot and the opposite end, with both forces acting to rotate the rod in a clockwise direction.
  • Arrangement D: The forces are applied at opposite ends of the rod, but both act in the same direction.

In which arrangement is the net turning effect (torque) about the pivot the greatest?

A

Arrangement A

B

Arrangement B

C

Arrangement C

D

Arrangement D

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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