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### 28 Cards in this Set

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 pulley a modified lever consisting of a rope that moves around a grooved wheel; can be movable or fixed distance principle states that any reduction in the effort force will be paid for by an increased distance through which that force must act lever a rigid bar capable of turning about a fulcrum mechanical advantage (M.A.) the amount by which a machine magnifies effort (force) law of moments the method for computing the amount of force exerted by levers with unequal arms; w(1)d(1) = w(2)d(2) block and tackle an arrangement of fixed and movable pulleys connected by ropes; has a high mechanical advantage second-class lever a lever in which the resistance is located between the fulcrum and the effort watt (W) the SI unit of power; 1 joule of energy per second scientific idealization approximating an answer when an extremely accurate one is not needed third-class lever a lever in which the effort is applied between the fulcrum and the resistance effort arm the distance from the fulcrum to the effort pitch the distance between two adjacent threads on a screw; how high or low a tone sounds to an observer (related to frequency) screw an inclined plane would around a cylinder or cone inclined plane a slanted surface used to raise object joule (J) the SI unit of energy; equal to 1 Newton-meter of work inclined plane a slanted surface used to raise objects efficiency the percent of work input returned as useful output wheel and axle modified lever in which the effort arm and the resistance arm revolve around a central fulcrum power the amount of work done in a given period of time P = W/t effort the force that must be applied to a simple machine to make it produce work resistance arm the distance from the fulcrum to the resistance resistance the force against which a simple machine works; opposition to the flow of electrons simple machines One or two part devices that make work easier: lever, wheel and axle, pulley, inclined plane, wedge, screw torque when the law of moments is not being met and there is pivoting on the fulcrum first-class lever a lever in which the fulcrum is located between the effort and the resistance work the product of the force applied on an object multiplied by the distance the object moved; w= F x d fulcrum the fixed point about which a lever turns wedge two inclined planes placed "back-to-back"