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28 Cards in this Set
- Front
- Back
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Block and tackle
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An arrangement of fixed and movable pulleys connected by ropes; has a high mechanical advantage.
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Distance principle
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states that any reduction in the effort force will be paid by an increased distance through which that force must act
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Efficiency
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the percent of work input that is returned as useful output
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Effort
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the force that must be applied to a simple machine to make it produce work
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Effort arm
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the distance from the fulcrum to the effort
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First class lever
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a lever in which the fulcrum is located between the effort and the resistance
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Fulcrum
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the fixed point about which a lever turns
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Inclined plane
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a slanted surface used to raise objects
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Joule
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the SI unit of energy
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Law of moments
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the method of computing the amount of force exerted by levers with unequal arms
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Lever
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a rigid bar capable of turning about a fulcrum
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Mechanical advantage
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the amount by which a machine magnifies effort
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Moment
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The tendency to cause rotation about a point or axis
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Pitch
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The distance between two adjacent threads on a screw
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Power
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the amount of work done in a given amount of time
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Pulley
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a modified lever consisting of a rope that moves around a grooved wheel; can be movable or fixed
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Resistance
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The force against which a simple machine works
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Resistance arm
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the distance from the fulcrum to the resistance
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Scientific idealization
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Approximating an answer when an extremely accurate one is not needed
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Screw
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An inclined plane wound around a cylinder or cone
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Second class lever
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a lever in which the resistance is located between the fulcrum and the effort
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Simple machines
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one or two part devices that make work easier; lever wheel and axle pulley inclined plane wedge and screw
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third class lever
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a lever in which the effort is applied between the fulcrum and the resistance
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Torque
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a turning or twisting force. the moment of a force; the measure of a force's tendency to produce torsion and rotation about an axis
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Watt
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The SI unit of power; One joule of energy per second
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Wedge
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Two inclined planes placed back to back
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Wheel and axle
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Modified lever in which the effort and arm and resistance revolve around a central fulcrum
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Work
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The product of the force applied on an object multiplied by the distance the object moved; W=F x d
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