| A | B |
|---|
| force | push or pull |
| net force | combination of all the forces acting on a n object |
| balanced forces | two or more forces exerted on an object; their effects cancel each other |
| unbalanced forces | effects don't cancel each other |
| Newton's first law of motion | describes how an object moves when the net force acting on it is zero |
| friction | force that brings nearly everything to a stop |
| Newton's second law of motion | an object acted upon by a force will accelerate in the direction of the force |
| weight | gravitational force on any object |
| center of mass | point in an object that moves as if all the object's mass were concentrated at that point |
| Newton's third law of motion | forces act in equal but opposite pairs |
