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18 Motion and Momentum
| Question | Answer |
|---|---|
| speed | the distance traveled divided by the time taken to travel the distance |
| average speed | divide the total distance traveled by the time taken |
| 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 | the change in velocity divided by the time it takes for the change to occur |
| mass | the amount of matter in the object |
| inertia | the tendency of an object to resist change in its motion |
| momentum | a measure of how hard it is to stop an object; depends on its mass and velocity |
| law of conservation of momentum | the total momentum of objects that collide is the same before and after the collision |