| A | B |
|---|
| mechanical advantage | the number of times that a machine increases an input force |
| actual mechanical advantage | the ratio of the output force to the input force in a machine |
| ideal mechanical advantage | the mechanical advantage of a machine in the absence of friction |
| effiency | the precentage of the work input that becomes work output in a machine |
| lever | a rigid bar that is free to move around a fixed point |
| fulcrum | the fixed point a lever rotates around |
| input arm | the distance between the fulcrum in a lever and the input force |
| output arm | the distance between the fulcrum in a lever and the output force |
| wheel and axle | a simple machine that consist of two rigidly attached disks or cylinders, each one with a different radius |
| inclined plane | a slanted surface along which a force moves an object to a different elevation |
| wedge | a V-shaped object whose sides are two inclinded planes sloped toward each other |
| screw | an inclined plane wrapped around a cylinder |
| pulley | a simple machine that consist of a rope that fits into a groove in a wheel |
| compound machine | a combination of two or more simple machines that operatee together |
