work power & simple machines
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Created by:
schnabel_anthony on January 18, 2012
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26 terms
Terms | Definitions |
|---|---|
 work | using force to move an object a distance |
| work formula | work= force x distance |
| unit of force is | newtons N |
| unit of distance is | meters M |
| one newton-meter is equal to | one joule |
| unit of work is | joule |
| power is | the rate at which work is done |
| power = | work/time |
| unit of power is | watt |
| wheel an axle | simple machine, a large wheel secured to a smaller wheel called an axle when one moves, the other moves |
| pulley | grooved wheel that turns freely in a frame called a block |
| fixed pulley | changes the direction of force however does not create a mechanical advantage |
| moveable pulley | a single moveable pulley creates a mechanical advantage does not change direction of a force |
| mechanical advantage | equal to the number of ropes that support the moveable pulley |
| inclined plane | an even sloping surface, makes it easier to move a weight from a lower to higher elevation |
| inclined plane | mechanical advantage of an inclined plane is equal to the length of the slope divided by the hight of the inclined plane |
| inclined plane | produces a mechanical advantage it does so by increasing the distance through which the force must move |
| wedge | is a modification of the inclined plane, are used as either separating or holding devices |
| wedge | can either be composed of one or two inclined planes |
| double wedge | thought as two inclined planes joined together with their sloping surfaces outward |
| screw | a modified version of the inclined plane |
| examples of screws | cylinder, threads of a screw, jar lid, drill bit |
| efficiency | the comparison of work input to work output |
| examples of wedges | log splitter, door stop, axe head. |
| efficiency | input force times distance = output force times distance |
| efficiency | never 100% due to friction |
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