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activity directed toward making or doing something.


si unit of energy.


(physics) the rate of doing work.


a unit of power equal to 1 joule per second.


a unit of power equal to 746 watts.


any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks.

input force

the force exerted on a machine.

input distance

the distance the input force acts through.

work input

the work done by the input force acting through the input distance.

work output

the work done by a machine.

output force

the force exerted on an object by a machine.

output distance

the distance the output force is exerted through.

mechanical advantage

the ratio of the force exerted by a machine to the force applied to it.

ideal mechanical advantage

the mechanical advantage that a machine would have without friction.

actual mechanical advantage

the mechanical advantage that a machine provides in a real situation.


the ratio of the output to the input of any system.


a rigid bar pivoted about a fulcrum.


the pivot about which a lever turns.

input arm

the distance between the input force and the fulcrum.

output arm

the distance between the output force and the fulcrum.

inclined plane

a simple machine for elevating objects.

wheel and axle

hoist so arranged that a rope unwinding from a wheel is wound onto a cylindrical drum or shaft coaxial with the wheel.


something solid that is usable as an inclined plane (shaped like a V) that can be pushed between two things to separate them.


slang terms for sexual intercourse.


a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope.

compound machine

a machine made of more than one simple machine.

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