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How machines do work (Input and output work (the input force times the…
How machines do work
Input and output work
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When you use a machine, the amount of input work equals the amount output work.
Efficiency of machines
in real situations, the output work is always less than the input work.
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Calculating Efficiency - To csalculate the efficency of a nachine, dovide the output by the input and multiple by 100.
Output and Input Forces
if you use a machine, to do work, you exert a force over distance. the force you exert on the machine called the input force.
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Increasing Force
when the output force is greater than the input force, the mechanical advantage is greater than 1.
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Changing Force
Some machines output force is greater than its input. If the amount of work stays the same, a decrease in force must mean an increase in distance.
Changing Distance
in other machines, the input is greater than the output. this kind of machine allows for the input force over a shorter distance.
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Increasing Distance
For a machine that increases distance, the output force is less than the input force. So in this case, the mechanical advantage is less than 1.
Changing Direction
If the direction changes, the input will be as the same as the output.