Laws of thermodynamics-

A perpetual motion machine is a hypothetical machine that can do work indefinitely without an energy source.

This kind of machine is impossible, as it would violate the first or second law of thermodynamics. Let's see how in the video-

One classification of perpetual motion machines refers to the particular law of thermodynamics the machines purport to violate:

• The first law of thermodynamics: When energy passes, as work, as heat, or with matter, into or out of a system, the system's internal energy changes in accord with the law of conservation of energy. Equivalently, perpetual motion machines of the first kind (machines that produce work with no energy input) are impossible.

• The second law of thermodynamics: In a natural thermodynamic process, the sum of the entropies of the interacting thermodynamic systems increases. Equivalently, perpetual motion machines of the second kind (machines that spontaneously convert thermal energy into mechanical work) are impossible.

• The third law of thermodynamics: The entropy of a system approaches a constant value as the temperature approaches absolute zero.^[2] With the exception of non-crystalline solids (glasses) the entropy of a system at absolute zero is typically close to zero.