| A | B |
|---|
| Work | the action that results when a force causes an object to move in the direction of the force. |
| Joule | The unit used to express work and energy. |
| Power | The rate at which work is done. |
| Watt | The unit used to express power. |
| Machine | A device that helps make work easier by changing the size or direction of a force. |
| Work Input | The work done on a machine. |
| Work Output | The work done by a machine. |
| Mechanical Advantage | A number that tells how many times a machine multiplies a force. |
| Mechanical Efficiency | A comparison expressed as a percentage of a machine's work output with the work input. |
| Lever | A simple machine consisting of a bar that pivots at a fixed point. |
| Wedge | A simple machine that is a double inclined plane that moves. |
| Inclined Plane | A simple machine that is a straight, slanted surface. |
| Screw | A simple machine that is an inclined plane wrapped around a spiral. |
| Wheel & Axle | A simple machine consisting of two circular objects of different sizes, the wheel being the large of the two circular objects. |
| Pulley | A simple machine consisting of a grooved wheel that holds a rope or cable. |
| Compound Machine | A machine that is made of two or more simple machines. |
| Block & Tackle | When a fixed pulley and a movable pulley are used together. |
