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Ch. 5 11-3-09
| Question | Answer |
|---|---|
| power is work done over a(n)_________ | time |
| distance between the threads of a screw is called the ______ | pitch |
| friction changes the useful work of a machine into ________ energy | thermal |
| if a weight lifter is holding barbells above his head, what does he have to do to perform work | lower barbells |
| a slanted surface used to raise an object is a(n) __________ | inclined plane |
| a bar that is free to pivot around a fixed point is a(n)_____ | lever |
| the rate at which work is done is called _______ | power |
| the amount by which a machine multiplies an effort force is called the _______ | mechanical advantage |
| an inclined plane with one or two sloping sides forms a machine called a(n) __________ | wedge |
| an inclined plane wrapped around a cylindrical post is a(n) _______ | screw |
| a winding mountain road is an example of a(n) ______ | inclined plane |
| work , like energy,is measured in | joules |
| the unit of power is the __________ | watt |
| 2 simple machines are part of a bike what are they | gear\wheel and axle |
| a wheelbarrow is an example of what type of letter_______ | second class |
| when 2 simple machines work together, they are called a(n)________ | compound machine |
Created by:
fallenheart
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