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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. |