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Moment definition
The moment of a force M, or torque, 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
Principle of moments
The principle of moments states that when a body is in equilibrium, the sum of clock wise moments about a pivot is equal to sum of anticlockwise moments about the same pivot
centre of gravity
The centre of gravity of an object is an imaginary point where the entire weight of the object seems to act.
stability definition.
The stability of an object is a measure of its ability to return its original position