Question

It is impossible to get perfect machines in practical life.why?

Answer 1

A machine whose efficiency is 100% is practically impossible to make as a 100% efficient machine has 0 mass and has 0 friction between its parts, which is impossible to achieve.

Answer 2

It is impossible to get perfect machines in practical life, because -

• The definition of a perfect machine states that a perfect machine should be 100% efficient which means the 100% of the energy input should be transformed into work output.

• But,in the real life situations,the 100% output is impossible because some of the energy input is consumed by the overcoming process from the friction and some of the energy transforms into heat energy.

• For these reasons,we cannot expect perfect machines in the real life situations.