Angular momentum is unchanged, but kinetic energy increases.
i) But there is no violation of conservation of energy
ii) There is a positive, net change in mechanical energy, because
The student does the work on the merry-go-round.
iii) origin of the energy is rotational motion.
According to the rule of conservation of energy, energy cannot be created or destroyed. It can, however, be converted from one form to another. When all forms of energy are considered, the overall energy of an isolated system remains constant. The law of energy conservation applies to all kinds of energy. In summary, the law of energy conservation asserts that
The total energy of a closed system, that is, a system that is separated from its surroundings, is preserved.
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