| A | B |
|---|
| Motion | when something is changing its position |
| Distance | actual amount that you have to travel between two points |
| Displacement | shortest route between two points |
| speed | the dstance an object travels in a unit of time |
| average speed | calculated by dividing the total distance traveled by the total time taken; it is an average |
| instantaneous speed | the speed of an object at one instant of time |
| velocity | the speed of the object and the direction of its motion |
| acceleration | when an object changes its motion;occurs when speed increases, decreases, or changes direction |
| mass | the amount of matter in an object |
| inertia | the tendency of an object to resist a change in its motion |
| momentum | a measure of how hard it is to stop the object, depends on the object's mass and velocity |
| law of conservation of momentum | the total momentum of objects that collide with each other is the same before and after the collision |
