Turning effects of forces
| Moments | Principle of moment | Centre of gravity | Stability | Quick Summary |
|Moment is the turning effect of forces.|
Moment of force = Force X perpendicular distance from the line of action of the force to the pivot
Moment = F X d
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|The SI unit of the moment of force is measured in Newton metre (Nm).|
Principle of moment
|Principle of moment states that:|
When a body is in equilibrium, the sum of clockwise moments about the balance point is equal to the sum of anticlockwise moments about the same point.
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Center of Gravity
Balancing cardboard and dustpan.
|Stability is a measure of a body's ability to maintain its original position.|
|If it returns to its original position after being displaced slightly, it is said to be in stable equilibrium.|
|If it continues to move away from its original position after being displaced, it is said to be in unstable equilibrium.|
|If it remains wherever it is displaced, it is
said to be in neutral equilibrium.
The stability of a body can be increased by: