| A | B |
|---|
| Rate at which the position of an object changes | speed |
| The unit used to measure force or weight in the metric system | newton |
| How a person sees an object's motion depends on the ___ the person chooses. | frame of reference |
| The friction from air molecules hitting an object | air resistance |
| The force of attraction that exists between any two objects | gravity |
| A device that displays instantaneous speed | speedometer |
| When a car stops, a person continues to move forward | inertia |
| Amount of matter in an object | mass |
| The rate at which an object changes velocity | acceleration |
| Another name for a push or a pull | force |
| Equal forces acting in opposite directions | balanced forces |
| A measure of the pull of gravity on an object's mass | weight |
| The combination of all the forces acting on an object | net force |
| Force that resists the movement of one surface past another | friction |
| An object's ___ depends on the observer's motion and the motion of other objects | relative motion |
| Rate at which an object is moving at any point in time | instantaneous speed |
| To say that an object is traveling at 10 m/sec toward the north is its | velocity |
