| A | B |
|---|
| force | a push or pull that causes an object to move, stop, or change direction |
| friction | a force that opposes, or acts against, motion when two surfaces rub against each other |
| magnetism | the force of attraction between magnetic objects |
| gravitation | the force that pulls all objects in the universe together |
| balanced forces | the forces acting on an object that are equal in size and opposite in direction |
| unbalanced forces | forces that are not equal |
| net force | the result of two or more forces acting on one object |
| power | the amount of work done for each period of time |
| machine | something that makes work easier by changing the size or the direction of a force |
| work | the use of a force to move an object through a distance |
