| A | B |
|---|
| work | use of force to move an object through a distance |
| friction | Force that opposes motion when two surfaces rub against each other |
| magnetism | Force of pushing or pulling between magnetic poles |
| gravitation | Force that pulls all objects toward each other |
| force | Push or pull that causes an object to move, stop, or change direction |
| machine | A thing that makes work seem easier by changing the size or direction of a force |
| balanced forces | Forces equal in size and opposite in direction |
| unbalanced forces | Opposing forces of which one force is greather than the other |
| acceleration | Change in object's motion, such as speeding up, slowing down, or changing directions |
| power | Amount of work done for each unit of time |
| net force | Value of combined forces on an object |
