| A | B |
|---|
| force | a push or a pull |
| motion | a change in position |
| speed | the measure of how fast something moves over a certain distance |
| gravity | the force that pulls objects to the earth |
| weight | a measure of the pull of gravity on an object |
| work | the measure of force it takes to move an object |
| simple machine | a tool that helps people do work |
| lever | a bar that move on or around a fixed point. like a seesaw |
| inclined plane | a flat surface set up at an angle to another surface. like a ramp. |
