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iphysics.2
Physic vocabulary and unknown words part 2
| Key terms | meaning |
|---|---|
| motion | change in position in a certain amount of time |
| frame of reference | the background or point that is stationary; compare to describe motion between objects |
| kinematics | study of how things move |
| dynamic | why does something move |
| statics | when objects are at rest and unchanging; equilibrium |
| linear motion | moving in a straight line |
| angular motion | an object moving in a circular motion |
| periodic motion | repeating motion |
| speed | rate which an object moves; speed=distance/time |
| constant speed | speed that does not change |
| average speed | dividing the total distance to the total time |
| instantaneous speed | the speed an objects has for a certain amount of time in a certain point in time |
| displacement | the distance from when an object starts and stops; displacement= final position - starting position |
| velocity | speed in a given direction |
| average velocity | displacement divided by time interval |
| Acceleration | a change in rate of velocity; (final velocity - start velocity)/time |
| Deceleration | when acceleration is negative |
| momentum | the mass of an object times its velocity |
| impulse | describe a time change of momentum |
| conservation of momentum | an object's momentum is changed due to an outside force |
| angular momentum | an object moving around a fixed point |