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Motion & Forces @wk
CCS 4th Grade Science
| Question | Answer |
|---|---|
| position | a certain place |
| motion | a change of position |
| frame of reference | the things around you that you can sense and use to describe motion |
| relative motion | a motion that is described based on a frame of reference |
| speed | a measure of an object’s change in position during a unit of time; for example, 10 meters per second |
| force | a push or pull |
| net force | the result of two or more forces acting together on an object |
| balanced force | a force that does not change the motion of an object |
| unbalanced force | a force that changes the motion of an object |
| acceleration | a change in the speed or direction of an object’s motion |
| newton | the metric unit of force |
| gravity | a force that pulls all objects toward each other |
| weight | a measure of the force of gravity upon an object |
| friction | a force that keeps objects that are touching each other from sliding past each other easily |
| magnetism | the force of repulsion (pushing) or attraction (pulling) between poles of magnets |
| power | the amount of work done for each unit of time |
Created by:
ekahl5
on 2012-02-20