| A | B |
|---|
| centripetal force | force that causes an object traveling in a curved path to move toward the center of that path |
| gravity | force of attraction between all objects in the universe |
| air resistance | force that opposes the downward motion of falling objects |
| friction | force that opposes the motion of an object |
| pressure | force per unit area |
| force | push or pull |
| Newton | metric unit of force |
| lubricants | substances that reduce friction |
| manometer | instrument for measuring the pressure of liquids |
| barometer | instrument for measuring the air pressure |
| fluid pressure | pressure in gases and lliquids |
| terminal velocity | the maximum speed of a falling object reached when the forces of air resistance and gravity acting on the object are equal |
| Bernouli's principle | principle that states that as the speed of a liquid increases, its pressure decreases |
| vacuum | empty space |
| centrifugal force | force that causes an object traveling in a curved path to move away from the center of that paty |
| spring scale | instrument used to measure the weight (pull of gravity on) an object |
