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FORCE 1. Anticlockwise moments: If turning effect is anticlockwise, the moment of force is called anticlockwise moment and is positive. 2. Centre of gravity: Centre of gravity of a body is the point about which the algebraic sum of moments of weights of all the particles constituting the body is equal to zero. 3. Centrifugal force: Force acting away from the centre of the circular path is called centrifugal force. 4. Centripetal force: Centripetal force is the force acting on a body moving in a circular path, in a direction which is always towards the centre of the circular path. 5. Clockwise moments: If turning effect is clockwise, the moment of force is called clockwise and is negative. 6. Couple: Two equal and opposite parallel forces not acting along the same line, forms a couple. 7. Dynamic equilibrium: Under the influence of the several forces, if