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15 Cards in this Set

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Work
transfers of energy that occurs when a force makes an object move; measured in joules.
Power
Amount of work done, or the amount of energy transferred, divided the time required to do the work or the transfer energy; measured in Watts (W).
Machine
device that makes doing work easier by increasing the force applied to an object, changing the direction of an applied force, or increasing the distance over which a force can be applied.
Input Force
The forced applied to a machine
Output Force
The forced applied by the machine.
Mechanical Advantage
ratio of the output force exerted by a machine to the input force applied to the machine
Efficiency
ratio of the output work done by the machine to the input work done on the machine
Simple machine
a machine that only does work with only one movement- lever, pulley, wheel and axle, inclined plane, screw and wedge.
Lever
simple machine consisting of a bar free to pivot about a fixed point called the fulcrum.
Pulley
simple machine that consists of a grooved wheel with a rope, chain or cable running along the groove; can either be fixed or movable.
Wheel and Axle
simple machine that consists of a shat or axle attached to the center of a larger wheel, so that the shaft and the wheel rotate together.
Inclined Plane
simple machine that consists of a sloping surface, such as a ramp, that reduces the amount of force needed to lift something by increasing the distance over which the force is applied.
Screw
simple machine that consists of an inclined plane wrapped in a spiral around a cylindrical post
Wedge
simple machine that is an inclined plane with one or two sloping sides.
Compound Machine
machine that is a combination of two or more simple machines.