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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 |