| A | B |
|---|
| force | a push or a pull |
| work | the use of a force to move an object through a distance |
| effort force | the force that is applied to do work |
| resistance force | a force that opposes an effort force |
| power | the amount of work done per second |
| Newton | the SI unit of Force |
| meter | the SI unit of length |
| Joule | the SI unit of work; equal to one N m |
| watt | the SI unit of power; equal to one J/s |
| simple machine | a device used to change the size, direction, or speed of a force being used to do work |
| mechanical advantage | the number of times the machine multipies an effort force |
| efficiency | compares the amount of work a machine does with the amount of work put into the machine |
| inclined plane | a simple machine that consists of a sloped surface |
| wedge | a modified inclined plane that has a thick end and a thinner or sharper end |
| screw | a modified inclined plane that is wound around a cylinder |
| lever | a rigid bar that moves around a fixed point |
| fulcrum | the point that a lever pivots on |
| effort arm | the distance from the effort force to the fulcrum |
| resistance arm | the distance from the resistance force to the fulcrum |
| pulley | a machine made up of a rope that turns around a wheel |
| wheel and axle | a simple machine made up of two wheels that turn around a pivot |
| compound machine | a machine made up of two or more simple machines |
