Forces in Action 0.0 / 5 ? PhysicsForcesFluidsASOCR Created by: Robert WassinkCreated on: 29-04-17 14:05 Tension The pulling force exerted by a string, cable or chain on an object. 1 of 16 Normal contact force The force exerted by a surface on an object, which acts perpendicularly to the surface. 2 of 16 Upthrust The upward buoyant force exerted on a body immersed in a fluid. 3 of 16 Friction The force that arises when two surfaces rub against each other. 4 of 16 Drag The resistive force on an object travelling through a fluid (air and water); the same as friction. 5 of 16 Centre of gravity An imaginary point at which the entire weight of an object appears to act. 6 of 16 Centre of mass A point through which any externally applied force produces straight-line motion but no rotation. 7 of 16 Terminal velocity The constant speed reached by an object when the drag force (and upthrust) is equal and opposite to the weight of the object. 8 of 16 Moment The product of force and perpendicular distance from a pivot or stated point. 9 of 16 Couple A pair of equal and opposite forces acting on a body but not in the same straight line. 10 of 16 Torque (of a couple) The product of one of the forces of a couple and the perpendicular distance between the forces. 11 of 16 Principle of Moments For a body in rotational equilibrium, the sum of the anticlockwise moments about any point is equal to the clockwise moments about that same point. 12 of 16 Density The mass per unit volume of a substance. 13 of 16 Pressure The force per unit cross-sectional area measured in pascals, Pa. 14 of 16 Archimedes' Principle The upthrust on a body immersed in fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces. 15 of 16 Triangle of Forces Three forces acting at a point in equilibrium, represented by the sides of a triangle. 16 of 16
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