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The rotational effect of a force on a body about an axis of rotation is described in terms of

  • A.Centre of gravity
  • B.Centripetal force
  • C.Centrifugal force
  • D.Moment of force

Answer: D

This is the moment of a force, or torque.

\[\tau = F \times r_\perp\] It measures the turning effect about an axis, and depends on where the force is applied as well as how large it is - which is why a longer spanner loosens a nut more easily.

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