There is gravity on the moon, which is only one-sixth that of the earth, and perpetual motion machines are impossible
Perpetual motion machines are a type of so-called gravity that does not require external input of energy. Energy or a machine that can continuously move and do work externally with only one heat source.
A machine that can do work forever without consuming energy violates the law of conservation of energy, so it is called the "first type of perpetual motion machine". A machine that continuously absorbs heat from seawater or air in nature and continuously converts it into mechanical energy without a temperature difference. It violates the second law of thermodynamics, so it is called a "second type of perpetual motion machine."
These two types of perpetual motion machines are concepts that violate the current objective scientific laws and cannot be created.
In 1775, the French Academy of Sciences passed a resolution announcing that it would never accept perpetual motion machines. Now the U.S. Patent and Trademark Office strictly prohibits the granting of patent certificates to applications for perpetual motion machines.