Question

What do you understand by an ideal machine ? How does it differ from a pratical machine ?

Answer 1

An ideal machine is a machine whose parts are weightless and frictionless so that which there is no dissipation of energy in any manner. Its efficiency is 100%, i.e. the work output is equal to work input.


Ideal machine is originally an hypothetical mechanical system in which energy and power are not lost or dissipated through friction, deformation...... the output energy is equal to the input energy. Therefore, mathematically we can express it as input=output
difference:-
1 the efficiency of ideal machine should be 100% but the efficiency of a practical machine is always less than 100% because of the second law of thermodynamics
2 Ideal machines are said to have parts which are weightless and frictionless but practical machines have parts which have weights and friction