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18 terms

simple machines

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work
the product of force and distance when a force is used to make an object move
joule
a unit of work equal to one newton-meter
machine
a device that changes the amount of force exerted or the direction in which the force is exerted
input force
the force exerted on a machine
output force
the force exerted on an object by a machine
mechanical advantage
the number of time the force exerted on a machine is multiplied by the machine
efficiency
the percentage of the input work that is converted to output work
actual mechanical advantage
the mechanical advantage that a machine provides in a real situation
ideal mechanical advantage
the mechanical advantage that a machine would have without friction
inclined plane
a simple machine consisting of a flat surface with one end higher than the other
wedge
a simple machine consisting of a device that is thick at one end and tapers to a thin edge at the other
screw
a simple machine that consists of an inclined plane wrapped around a central cylinder to form a spiral
lever
a simple machine consisting of a rigid object that pivots about a fixed point
fulcrum
the fixed point around which a lever pivots
wheel and axle
a simple machine consisting of two circular or cylindrical objects that are fastened together and rotate about a common axis
pulley
a simple machine consisting of a grooved wheel around which is wrapped a rope, chain, or cable
compound machine
a device that combines two or more simple machines
gears
two or more wheels linked together by interlocking teeth