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Force/Motion

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force
a push or a pull on an object that can cause it to change direction
gravity
a force that pulls any two objects toward one another, such as you toward the center of the earth
inertia
the tendency of a moving object to stay in motion or a resting object to stay at rest
friction
a force that slows the motion of a moving object
energy
the ability to do work
potential energy
energy than an object has because of position
kinetic energy
energy of motion
mechanical energy
the kind of energy an object has because it can move or because it is moving
chemical energy
energy that comes from chemical changes
electrical energy
energy that comes from the flow of electricity
work
the result of a force moving an object
simple machine
a machine made of one or two parts
inclined plane
a simple machine with a flat surface and one end higher than the other
wheel and axle
a simple machine made of a wheel attached to a rod
wedge
a simple machine that has slanted sides
lever
a simple machine with a fulcrum that changes the direction of the force
pulley
a simple machine that uses a rope and a wheel
screw
a simple machine that has an inclined plane wrapped around a rod
compound machine
a machine made of two or more simple machines
complex machine
a machine made of many simple and compound machines