| A | B |
|---|
| work | the result of using force to move an object over a distance. |
| power | the rate at which work is completed |
| force | it overcomes gravity and mass |
| kilowatt hours | units for total energy consumption |
| simple machine | a device that changes the size or direction of a force. |
| inclined plane | simple machine with no moving parts which gradually spreads out the amount of force. |
| lever | transfers effort and changes the way work is done. 3 different parts |
| fulcrum | point that supports the lever(pivot point) |
| effort arm | part of the lever between the fulcrum and the point where force is applied. |
| fixed pulley | changes the direction of the effort force, but does not multiply effort force. |
| moveable pulley | reduces the effort force, but does not change the direction of the effort force. |
| ideal machine | imaginary machine in which there is no friction |
| mechanical advantage | the factor by which a machine multiplies effort in order to equal resistance |
| efficiency | the ratio of work done by a machine to the work put into it |
