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Question

Class III levers have mechanical advantage less than one. It cannot be used:


A

To obtain gain in speed

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B

To obtain loss in speed

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C

It acts as force multiplier

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D

It is used in raising a load

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Solution

The correct options are
B

To obtain loss in speed


C

It acts as force multiplier


D

It is used in raising a load


Class III levers have mechanical advantage less than one, but by using them we get a gain in speed, i.e. a larger movement of the load is obtained by smaller movement of effort. For example, the blade of a knife moves longer by smaller movement of its handle.


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