The sum of all the potential energy and kinetic energy of an object equals its mechanical energy.
Is the total of kinetic and potential energy zero?
In other words, the object's total changes in potential and kinetic energy are always zero. Accordingly, if an object's potential energy increases, its kinetic energy must also decrease by the equal amount.
The total kinetic and potential energy of all the particles in an object is the thermal energy. The graph demonstrates that as potential or kinetic energy rises, thermal energy does as well.
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