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How Things Move
Chapter 11 motion and energy
Term | Definition |
---|---|
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. |