| A | B |
|---|
| position | the location of an object |
| distance | the amount of space between two objects |
| motion | a change in position, movement |
| speed | how quickly an object moves |
| force | a push or a pull |
| friction | a force that occurs when one object rubs against another |
| weight | a measure of the pull of gravity on an object |
| gravity | pulling force between two objects, such as you and the Earth |
| magnet | any object with a magnetic force |
| work | done when a force moves an object or changes an object's motion |
| energy | the ability to do work |
| kinetic energy | the energy of motion |
| potential energy | stored energy that is ready to be used |
| simple machine | a machine with few or no moving parts |
| compound machine | a machine with two or more simple machines put together |
| lever | a simple machine made of a straight bar that moves on a fixed plane |
| pulley | a kind of lever that uses a rope and a wheel to lift an object |
| wheel and axle | a kind of lever that is made of a wheel that moves around a post |
| inclined plane | a simple machine made of a flat, slanted surface |
| screw | a kind of inclined plane wrapped around into a spiral |
| wedge | a simple machine that splits an object apart |
