| A | B |
|---|
| Newton's 1st Law | an object at rest or moving at a constant speed in a straight path will continue to do so until a net force acts on it |
| Newton's 2nd Law | an object acted upon by a force will accelerate in the direction of the force |
| normal force | outward force from a surface |
| force | push or pull |
| unbalanced forces | net forces on an object are not zero |
| balanced forces | two or more forces whose effects cancel each other |
| net forces | total force felt by an object |
| Newton's 3rd Law | forces always act in equal but opposite pairs |
| friction | rubbing force that acts against motion between two touching surfaces |
| sliding friction | friction that slows down objects |
| wheel | helps reduce sliding friction |
| terminal velocity | the speed an object reaches when the force of gravity is balanced by the force of air resistance |
| rolling friction | enables you to ride a bike without skidding or falling |
| gravity | exists between any two objects with mass |
