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simple machine

one of the basic machines that make up other machines


a simple machine made up of a bar that turns on a fixed point


the fixed point, or point that does not move, on a lever

effort force

the force put on one part of a simple machine, for example, when you push or pull on a lever


that which is done on an object when a force moves moves an object through a distance


a simple machine made up of a rope or chain and a wheel around which the rope or chain fits

wheel and axle

a simple machine made up of a large wheel attached to a smaller wheel or rod

inclined plane

a flat surface with one end higher than the other


how well a machine changes effort into useful work


an inclined plane wrapped around a pole


a machine made of two inclined planes placed back-to-back


a certain place


a change of position

frame of reference

the things around you that you can sense and use to describe motion


a measure of an object's change in position during a unit of time; for example, 10 meters per second


a push or pull


the metric, or System International(SI) unit of force


a change in the speed or direction of an object's motion


a force that pulls all objects towards each other


a measure of the force of gravity upon an object


a force that keeps objects that are touching each other from sliding past each other easily

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