| 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 amount of force exerted or the direction in which force is exerted. |
| input force | The force exerted on a machine. |
| output force | The force exerted on an object 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. |
| wedge | An inclined plane that moves. |
| 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 machines. |
| gears | Two or more wheels linked together by interlocking teeth. |
| tendon | A band of connective tissue that attaches a muscle to a bone. |
