| A | B |
|---|
| machine | a device that helps us do work |
| force | a push or a pull that makes an object move |
| friction | a force that slows down motion between two objects that touch |
| work | is the result of a force moving an object |
| power | is the time rate of doing work |
| energy | is the ability to do work |
| simple machines | a machine that operates without electricity and is used to make work easier |
| incline plane | a sloping surface used to move heavy loads up or down |
| wedge | is made up of two incline planes that come to a point or sharp edge |
| screw | is an incline plane that curves around a shaft, or pole |
| lever | is a bar that can rest and turn on a fulcrum to move heavy objects |
| fulcrum | is the resting or balance point upon which a lever turns |
| wheel and axle | a wheel or set of wheels fastened to a bar |
| pulley | is a wheel with a groove that a rope or wire fits into |
