| 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 greater than the other |
| acceleration | change in an object's motion, such as speeding up, slowing down, or changing direction |
| power | amount of work done for each unit of time |
| net force | value of combined forces on an object |
