| A | B |
| acceleration | rate of change of velocity |
| inertia | tendency of object to resist change in motion |
| Newton's first law of motion | object at constant velocity keeps moving at that velocity unless unbalanced force acts upon it |
| Newton's second law of motion | object's accelleration is same direction & equal to net force divided by mass |
| Newton's third law of motion | when 1 object exerts force on 2nd object, 2nd exerts equal force in opposite direction |
| air resistance | friction-like force opposes motion through air |
| terminal velocity | maximum speed when falling through substance (air) |
| free fall | when gravity is only force affecting a fall |
| centripetal force | force exerted toward center of curved path |
| law of conservation of motion | group of objects exerts force on on eath other, total momentum does not change |
| momentum | property of a moving object that equals its mass times velocity |