a) Moments

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Last updated 8:45 PM on 2/27/26
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8 Terms

1
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  • define moment

  • the turning effect of a force about a point

2
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  • state the formula for moment

  • M = Fx

    • moment of a force (Nm) = force acting on the object (N) × perpendicular distance between the force and the pivot (m)

3
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  • define perpendicular distance

  • the distance

  • → between the force and the pivot

  • → at which the angle between the distance and the force is 90°

4
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  • define pivot

  • the point at which an object turns

5
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  • define equilibrium

  • the state of a system having zero resultant force and zero net moment

6
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  • describe the forces in a system in equilibrium

  • sum of upwards forces = sum of downwards forces

7
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  • state the principle of moments

  • for a system in equilibrium

  • sum of anticlockwise moments = sum of clockwise moments

8
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  • define anticlockwise moment

  • define clockwise moment

  • the moment that causes the object to turn anticlockwise

  • the moment that causes the object to turn clockwise