| A | B |
|---|
| work | occurs when a force causes an object to move in the direction of the force |
| power | the rate at which work is done |
| machine | a device that helps make work easier by changing the size or direction of the force |
| work input | work done by you on a machine |
| mechanical advantage | how many times the machine multiplies the force |
| lever | simple machine consisting of a bar that pivots at a fixed point called a fulcrum |
| wedge | a double inclined plane that moves |
| wheel and axle | simple machine consisting of 2 circular objects of different sizes (wheel is the larger of the two) |
| joule | the unit of work |
| watt | the unit of power |
| compound machine | machines that are made of two or more simple machines |
| pulley | simple machine consisting of a grooved wheel that holds a rope or a cable |
| screw | an inclined plane that is wrapped in a spiral |
| inclined plane | simple machine that is a straight, slanted surface |
| mechanical efficiency | a comparison of a machine's work output with the work input |
| work output | work done by a machine on an object |
