All terms in this list:
simple machine: have one or two parts and help make work easier
wedge: made from two slanted sides that end in a sharp edge
lever: it's a stiff bar that rests on a support called a fulcrum
inclined plane: a ramp,a slanted surface that connects a lower level to a higher level
screw: an inclined plane wrapped around a center post
wheel & axel: a round wheel attached to a post called an axel
pulley: it changes the direction of motion in an object to which a force is applied
force: a push or a pull
motion: movement
balanced force: a two forces acting in the opposite direction the object does not move
unbalanced force: forces that cause a change in motion the object does
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