How is the mechanical advantage related with the velocity ratio for an actual machine ? State whether the efficiency of such a machine is equal to 1, less than 1 or more than 1.

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Solution

The mechanical advantage for an actual machine is equal to the product of its efficiency and velocity ratio

For a practical machine, the efficiency of such a machine is always less than 1, i.e. $h < 1$ . This is because there is always some loss of energy in form of friction etc.

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State one reason why is mechanical advantage less than the velocity ratio for an actual machine.

Select the incorrect statement :

(a) A machine always has the efficiency less than $100 %$ .

(b) The mechanical advantage of a machine can be less than 1.

(d) A machine can have the mechanical advantage greater than the velocity ratio.

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