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18 Cards in this Set

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Work
Force exerted on an object that causes it to move.
Joule
A unit of work equal to one newton-meter.
Power
The rate at which work is done.
Machine
A device that changes the amount of force exerted, the distance over which a force is exerted, or the direction in which force is exerted.
Input Force
The force exerted on a machine.
Output Force
The force exerted on an object by a machine.
Input Work
The work done on a machine as the input force acts through the input distance.
Output Work
The work done by a machine as the output force acts through the output distance.
Mechanical Advantage
The number of times a machine increases a force exerted on it.
Efficiency
The percentage of the input work that is converted to output work.
Inclined Plane
A simple machine that is a flat, sloped surface.
Wedge
A simple machine that is an inclined plane that moves.
Screw
A simple machine that is an inclined plane wrapped around a central cylinder to form a spiral.
Lever
A simple machine that consists of a rigid bar that pivots about a fixed point.
Fulcrum
The fixed point around which a lever pivots.
Wheel and Axle
A simple machine that consists of two attached circular or cylindrical objects that rotate about a common axis, each one with a different radius.
Pulley
A simple machine that consists of a grooved wheel with a rope or cable wrapped around it.
Compound Machine
A device that combines two or more simple machines.