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Work and Power Vocab
chapter 8 vocabulary
Word | Definition |
---|---|
work | when a force causes an object to move in the same direction of that force |
joule | unit used to express energy |
power | rate energy is being transferred |
watt | unit to express power |
machine | device that makes work easier by changing size or direction of the force |
work input | work done on a machine |
work output | work done by a machine |
machanical advantage | number that tells how many times a machine multiplies a force |
mechanical efficiency | comparison of work input and output |
lever | bar that pivots on a fulcrum |
pulley | simple machine, has a grooved wheel that holds a rope or cable |
wheel and axel | 2 circular objects of different sizes, the wheel is the larger of the two |
inclined plane | straight slanted surface |
wedge | pair of inclined planes that move |
screw | inclined plane wrapped around a cylinder |
compound machine | made up with more that one simple machine |