| A | B |
|---|
| mass | how much matter an object is made of |
| potential energy | stored energy; energy that is ready to be used |
| kinetic energy | the energy of any moving object |
| force | a push or a pull |
| inertia | an object tends to keep doing what it’s doing; if moving it will keep moving in a straight line OR if sitting still it will keep sitting still UNLESS a force acts upon it |
| speed | how fast an object’s position changes with time at any given moment |
| velocity | the speed and direction of a moving object |
| acceleration | change in velocity with respect to time |
| friction | a force that opposes the motion of one object moving past another |
| air resistance | a type of friction; air flow opposes the motion of moving objects |
| unbalanced forces | forces that cause an object to move |
| balanced forces | forces that cancel each other out when acting together on a single object and do NOT cause motion |
| action | the force one object applies to a second |
| reaction | the force with which an object responds to an action |
| work | the use of force to move an object |
| gravity | the force of attraction between any objects due to their mass |
| weight | the force of gravity between earth and an object |
