|
 Work | The transfer of energy to an object by using a force that causes the object to move a distance |
| Joule | Unit used to express work and energy |
| Machine | A device used to make work easier by changing the size or direction of force |
| Work Input | Work done on a machine (human effort applied) |
| Work Output | Work done by a machine |
| Mechanical Advantage | A number that tells how many times a machine multiplies force; represents the degree to which work is made easier |
| Mechanical Efficiency | A measure of the work output to work input which tells a machine's ability to overcome friction; Expressed as a percentage (Work output /Work input x 100) |
| Power | The rate (speed) at which work is done and energy is transferred; It measures how fast work happens or energy is transferred |
| Watt | Unit used to express power which is the same as Joules/second |