| A | B |
|---|
| air resistance | form of friction in air |
| speed | how fast an object moves |
| constant speed | object covers equal distances in equal amounts of time |
| distance divided by time | how to calculate speed |
| velocity | describes both speed and direction |
| momentum | Product of an object's mass and velocity |
| momentum=mass x velocity | equation for momentum |
| acceleration | change in velocity |
| final velocity minus initial velocity divided by time | equation for acceleration |
| force | a push or pull |
| weight | downward force on objects due to gravity |
| net force | total of all forces acting on object |
| newton | SI unit for force |
| balanced forces | forces that cancel each other out |
| friction | force between motion of two objects that opposes motion of either. |
| gravity | force that decreases as objects move away from each other. |
| mass | quantity of matter in an object |
| An object at rest remains at rest and an object in motion remains in motion unless acted upon by an unbalanced force | Newton's first law |
| unbalanced force acting on an object equals mass times its acceleration | Newton's second law |
| for every action force there is an equal and opposite reaction force | Newton's third law |
