| A | B |
|---|
| Work | a force moving on an object through distance; when the distance the object movesin the same direction as the force applied. |
| Joule | a unit of work; equal to one Newton-meter. |
| Power | the rate at which work is done; calculated by dividing work by time. |
| Watt | a unit of power; equal to one joule per second. |
| Machine | an instrument that makes work easier; any device that helps you to do something. |
| Work Input | The work that goes into the machine; comes from the force that is applied to the machine, or the effort force. |
| Work Output | the work done by the machine. |
| Efficiency | the comparison of work output to work input. |
| Mechanical Advantage | the number of times a machine multiplies the effort force. |
| Simple Machines | a mechanical device with few or no moving parts. |
| Inclined Plane | a simple machine consisting of a flat slanted surface. |
| Wedge | a simple machine with two inclined planes. |
| Screw | Simple machine made up of an inclined plan wrapped around a central bar. |
| Level | simple machine consisting of a rigid bar that is free to pivot at the fulcrum. |
| First Class | Fulcrum is between the effort and resistance force. |
| Second Class | resistance is between the fulcrum and effort force. |
| Third Class | the effort force is between the resistance and fulcrum. |
| Wheel and Axle | simple machine made up of two circular objects of different sizes. The wheel(larger object) turns about a smaller object (the axle). |
| Pulley | simple machine made up of a rope, belt, or chain wrapped around a grooved wheel. |
| Fulcrum | the fixed point of a lever, or the point from which movement originates. |
| Effort Force | the point where force is applied to a simple machine. |
| Resistance Force | the point of the load of a simple machine, or the thing you are trying to push, pull, lift, or move. |
| Compound Machine | combination of two or more simple machines, and can also be called a complex machine. |
