Question

Why is the efficiency of a machine always less than 100 percent

Answer 1

energy is lost due to friction or air resistance, through sound and heat energy.

Answer 2

Explanation :

The efficiency of a machine is always less than 100 %. This is because some of the energy gets lost in the form of heat energy, sound energy and frictional energy.

Mathematically it is defined as :

`\eta=(W_o)/(W_i)`

Where,

`\eta` is the efficiency

`W_o` is output work

`W_i` is input work

Hence, this is the required explanation.