| A | B |
|---|
| Work | Occurs when a force moves an object over a distance in the same direction as the force |
| Formula for Work | Force times distance |
| Joule | Unit for work |
| Joule | Also called a Newton-meter (N-m) |
| Power | Rate at which work is being done |
| Formula for Power | Work divided by time |
| Watt | Unit for power |
| Watt | Also called joule per second (J/s) |
| Machine | Changes the size or direction of a force to make work easier |
| Work Input | Work that you put into a machine |
| Work Output | Work that is done by the machine |
| Mechanical Advantage | Numerical value given to a machine which tells how many times the machine multiplies a force |
| Mechanical Efficiency | Compares the work done by the machine with the work you put into the machine |
| Mechanical Efficiency (ME) | Always expressed as a percentage and will always be less than 100% |
| Formula for Mechanical Efficiency | Work output divided by work input times 100 |
| Simple Machines | Lever, pulley, wheel and axle, inclined plane, wedge, and screw |
| Lever Family | Lever, pulley, wheel and axle |
| Lever | Three types are first, second, and third class |
| Fulcrum | Point at which a lever rotates |
| Inclined Plane Family | Inclined plane, wedge, and screw |
| Compound Machine | Machine made up of two or more simple machines |
