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unit 2 lessons 1-3
vocab
| Term | Definition |
|---|---|
| work | use of force to move an object in some distance in the direction of the force |
| power | the rate at which work is done |
| energy | the ability to do work |
| kinetic energy | the energy of motion |
| potential energy | the energy an object has of its position,condition,or chemical compostion |
| mechanical energy | energy possessed by an object due to its motion and postion |
| machine | any device that helps people do work by changing the way work is done |
| mechanical advantage | the number of times the machine multiplies the input force |
| mechanical efficiency | a comparison of a machines work output with the work input |
| lever | a simple machine that has a bar that pivots at a fixed point |
| fulcrum | the fixed point is called the fulcrum |
| wheel and axle | a simple machine that is made of a wheel connected to a smaller cylindrical object, the axle |
| pulley | a simple machine that has a grooved wheel that hold a rope or cable |
| inclined place | a simple machine that is a straight, slanted surface |
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