| A | B |
|---|
| force | a push or a pull |
| gravity | on the earth, a force that pulls all objects toward the center of the earth |
| motion | a change in position |
| friction | the force that resists the movement of objects against each other |
| work | occurs when a force moves an object over a distance |
| machine | an object that makes work easier |
| effort | the force applied to a simple machine to cause the object to move (work happens) |
| load | the weight of an object being moved |
| lever | a type of simple machine; a bar that turns on a point |
| fulcrum | the point on which a lever turns |
| wheel and axle | a type of simple machine; a wheel with a rod running through it |
| gears | wheels and axles with "teeth" that work together |
| pulley | a type of simple machine; a grooved wheel with a rope that fits the groove |
| inclined plane | a type of simple machine; a flat, sloped surface |
| screw | a type of simple machine; an inclined plane wound around an axle |
| wedge | a type of simple machine; one of more inclined planes used to force material apart |
