According to the principle of the immortality of energy, energy cannot be created or destroyed but can change from one form to another
The following shows two brief examples involving changes in energy forms
Simple pendulum swing:
The pendulum in position A has maximum gravitational potential energy
The pendulum moves from position A to position B causing the gravitational potential energy to change to kinetic energy and the kinetic energy to be at maximum
The pendulum moves from position B to position C causing the kinetic energy to decrease, the kinetic energy changes to gravitational potential energy and the gravitational potential energy is in the maximum state
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