| A | B |
|---|
| position | the exact place where an object is |
| direction | the way an object faces |
| relative position | the position of one object compared with the position of another object |
| motion | an object's position changes |
| distance | how far something travels |
| speed | measure of how slow or fast something can move |
| force | a push or a pul |
| exert | apply a force |
| contact forces | act between objects that are touching |
| tension forces | a pulling force that stretches something |
| spring forces | exerted by an object that has been stretched or squeezed |
| friction | a force that goes against the motion of an object |
| noncontact forces | forces that can act at a distance |
| gravity | a force that acts between any two objects that pulls them toward one another |
| balanced forces | when both forces are equally strong |
| net force | the sum of forces acting on an object |
