Physics Tuition Singapore – Turning Effect of Forces Important Definitions

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Physics Tuition Singapore – Turning Effect of Forces Important Definitions

1. The moment of a force about a pivot is the product of the force F and the perpendicular distance d from the pivot to the line of action of the force.

Moment of a force ,Fxd

2. The SI unit for moment of a force is newton metre (N m).
3. Moment of a force is a vector. The direction of the moment of a force is either clockwise or anticlockwise about the pivot.

4. There are two conditions for an object in equilibrium:

• Net external force F_N = 0
• Net moment due to external forces = 0 (also known as the Principle of Moments)

5. The Principle of Moments states that when an object is in equilibrium, the sum of the clockwise moments equals the sum of the anticlockwise moments.
6. The centre of gravity of an object is the point at which its entire weight appears to act. The centre of gravity of regular-shaped objects can be determined by geometrical symmetry. The centre of gravity of irregular-shaped objects can be determined by the plumb line experiment.

7. The stability of an object increases when the base area increases or when the centre of gravity is lowered.

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