Forces in Action 0.0 / 5 ? PhysicsForcesASOCR Created by: AntoniadfCreated on: 03-04-17 12:40 Force A push or pull on an object (in newtons). 1 of 13 Weight The gravitational force of an object (in newtons). 2 of 13 Centre of mass A point through which any externally applied force produces a straight line of motion, no rotation. 3 of 13 Centre of Gravity An imaginary point at which the entire weight of an object appears to act. 4 of 13 Drag Force The resistive force exerted by a fluid on an object moving through it. 5 of 13 Terminal Velocity The constant speed reached by an object when drag force is equal to the weight of the object. 6 of 13 Moment The product of the force and perpendicular distance from the pivot. 7 of 13 Principle of Moments For a body in rotational equilibrium the sum of the anti-clockwise moments about a point is equal to the clockwise moments about the same point. 8 of 13 Torque The product of one of the forces of a couple and the perpendicular distance between them. 9 of 13 Couple A pair of equal and opposite forces acting on a body but not in the same straight line. 10 of 13 Fluids A substance that can flow (liquids and gases). 11 of 13 Upthrust The upward bouyant force exerted on a body immersed in water. 12 of 13 Archimedes' principle The upthrust on an object in a fluid is equal to the weight of the fluid it displaces. 13 of 13

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