| A | B |
|---|
| inertia | resistance to change in motion |
| velocity | includes speed and direction |
| acceleration | rate of change in velocity |
| distance | measured in units of meters/kilometers |
| speed | distance traveled divided by time of travel |
| rate | change over time |
| motion | change in position relative to reference point |
| Newton's first law | An object in motion will stay in motion and an object at rest will stay at rest unless acted on by a force |
| Name for Newton's 1st law | Law of inertia |
| physical science | study of matter and energy |
| mass | amount of matter in an object |
| volume | amount of space in an object |
| balanced forces | equal in size and opposite in direction |
| unbalanced forces | unequal in size, can be opposite or same direction |
| friction | force between surfaces of two objects |
| gravity | attractive force between two objects |
| weight | a measure of the force of gravity |
