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Motion and Forces
Question | Answer |
---|---|
speed | the rate of change of an object's position |
average speed | total distance divided by total time |
constant speed | a speed that doesn't vary |
instantaneous speed | speed at a given moment |
acceleration | the rate at which velocity changes |
momentum | the quantity of motion of a moving body (p=mv) |
gravity | a force of attraction between objects |
weight | a measure of the force of gravity between objects |
mass | the amount of matter in an object, not affected by gravity |
free fall | occurs when the only force acting on a falling object is gravity |
terminal velocity | the fastest speed a falling object achieves |
centripetal acceleration | occurs when an object continually accelerates due to moving in a circle (moon, satellites) |
projectile | any object that is thrown or shot |
inertia | the tendency of an object to resist a change in its motion |
velocity | the speed AND direction of a moving object |