| A | B |
|---|
| work | force exerted on an object that causes it to move |
| joule | a unit of work equal to one newton-meter |
| machine | a device that changes the asize or direction of a force |
| input force | the force you put on a machine |
| output force | the force exerted on an oject by a machine |
| mechanical advantage | the number of times the force exerted on a machine is multiplied by the machine |
| efficiency | the percentage of the input work that is converted to output work |
| actual mechanical advantage | the mechanical advantage that a machine provides in a real situation |
| ideal mechanical advantage | the mechanical advantage that a machine would have without friction |
| inclined plane | a flat surface with one end higher than the other,a ramp for example |
| wedge | an inclined plane tha moves, a knife for example |
| screw | an inclined plane wrapped around a central cylinder to form a spiral |
| lever | a rigid object that pivots about a fixed point |
| fulcrum | the fixed point around which a lever pivots |
| wheel and axle | two circular or cylindrical objects that are fastened together and rotate about a common axis |
| pulley | a grooved wheel around which is wrapped a rope, chain, or cable. |
| compound machine | a device that combines two or more simple machine |
| gears | two or more wheel s linked together by interlocking teeth |
