Broggi Work, Power and Simple Machines
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Created by:
redteamscience on March 28, 2012
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18 terms
Terms | Definitions |
|---|---|
 Work | the transfer of energy to an object when the force applied causes the object to move in the direction of the force W = force x distance |
| Joule (J) | the unit of measure for work. equals 1 newton meter |
| Power | the rate at which work is done or energy is transformed Power = work / time |
| Watt (W) | the unit of measure for power. equals 1 Joule / second |
| Machine | a device that helps do work(makes it easier) by either overcoming a force or changing the direction of the applied force |
| work input | the work done on a machine the product of input force x distance |
| work output | the work done by a machine the product of output force x distance |
| mechanical advantage | the number that tells you how many times the machine multiplies the input force MA = output force/input force |
| mechanical efficiency | a % that measures the ratio of work output to work input ME = work output/work input X 100 |
| pulley | a machine with a grooved wheel holding a rope |
| wheel and axle | a machine consisting of 2 circular objects of different sizes |
| fulcrum | a fixed point on a lever |
| lever | a machine that has a bar that pivots at a fixed point |
| first class lever | a lever where the fulcrums between the input force and load |
| second class lever | a lever where the load is between the input force and the fulcrum |
| third class lever | a lever where the input force is between the fulcrum and the load |
| compound machine | a machine that is made up of 2 or more simple machines |
| inclined plane | a machine that is a straight, slanted surface |
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