Physics definitions 0.0 / 5 PhysicsForcesASEdexcel Created by: KateCreated on: 09-10-13 13:36 Vector Any physical quantity that has a direction and a magnitude 1 of 9 Scalar Any physical quantity that isn't directional 2 of 9 Moment The force x perpendicular distance from the line of action of the force to the point 3 of 9 Principle of moments Sum of clockwise moments = sum of anticlockwise moments 4 of 9 Centre of mass The point through which a single force on the body has no turning effect 5 of 9 Stability If a body in stable equilibrium is displaced it will return to its original position 6 of 9 Couple A pair of equal and opposite forces acting on a body 7 of 9 Torque The moment of a couple 8 of 9 Rule of equilibrium When 2 objects interact they always exert equal and opposite forces on one another 9 of 9

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