| A | B |
|---|
| work | is the product of force and distance |
| Power | is the rate of doing work |
| horsepower | is equal to about 746 watts |
| joule | is the SI unit of work |
| watt | is the SI unit of power |
| machine | is a device that changes a force |
| input distance | the distance the input force acts through |
| output force | the force that is exerted by a machine is called the |
| work output | is the output force multiplied by the output distance |
| input force | the force your exert on a machine |
| work input | work done by the input force acting through the input distance |
| output distance | the distance the output force is exerted through is |
| mechanical advantage | is the number of times that the machine increases the input force |
| actual mechanical advantage | equals the ratio of the output force to the input force |
| ideal mechanical advantage | is the mechanical advantage in the absence of friction |
| efficiency | the percentage of the work input that becomes work output |
| lever | a rigid bar that is free to move around a fixed point |
| fulcrum | fixed point the bar rotates around |
| input arm | is the distance between the input force and the fulcrum |
| output arm | is the distance between the output force and the fulcrum |
| wheel and axle | is a simple machine that consist of two disks or cylinders, each one with a different radius |
| incline plane | is a slanted surface along which a force moves an object to a differnt elevation |
| wedge | is a V-shaped object whose sides are two inclined planes sloped toward each other |
| screw | is an inclined plane wrapped around a cylinder |
| pulley | is a simple machine that consists of a rope that fits into a groove in a wheel |
| compound machine | is a combination of two or more simple machines that operate together |
