Moment of force - is the product of force & its perpendicular distance from its pivot to the line of action of the force, Centre of gravity - is the point on/outside the body where its weight appears to act, work done - is the product of the force & the distance moved by the object in the direction of the force, Energy - is the ability to do work, Kinetic energy - is the energy possessed by an object because of its motion, Gravitational potential energy - is the energy stored in a body due to its height from the ground, Power - is the rate of doing work, Principal of moments - When an object is in equillibrium, the sum of clockwise moments is equal to the sum of anti-clockwise moments about the same pivot., Principal of conservation of energy - Energy cannot be created or destroyed but can only be transformed from one form to another. The total energy in an isolated system is constant,

Physics Definitions Chapter 5-6

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