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How Things Move

Chapter 11 motion and energy

position The place where something is.
motion A change in the position of an object.
speed How far something moves in a certain amount of time.
force A push or pull on an object.
gravity A force that pulls down on everything on Earth.
friction A force that slows down moving things.
simple machine A tool that changes the size or direction of a force.
lever A simple machine made of a bar that moves against an unmoving point.
fulcrum The unmoving point that a lever moves against.
ramp A simple machine with a flat, slanted surface.
attract To pull towards something.
poles Two ends of a magnet.
repel To push away or apart.
Created by: sdickinson