| A | B |
|---|
| force | push or pull |
| grav ity | force of attraction between all objects |
| newton | metric unit of force |
| air resistance | force that opposes the downward motion of a falling object |
| terminal velocity | speed at which air resistance and gravity acting on a falling object are equal |
| vacuum | empty space |
| friction | force that opposes the motion of an object |
| lubricants | substances that reduce friction |
| fluid pressure | pressure in gases and liquids |
| pressure | force per unit of mass |
| barometer | instrument used to measure air pressure |
| manometer | instrument used to measure pressure in a liquid |
| Bernoulli's Principle | states that as the speed of a fluid increases, its pressure decreases |
