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Total Mechanical Energy, TME, is:

The sum of the potential and kinetic energies when there is no change in the internal energy.

TME has the formula:

TME = Ek + Ep

An example where we use TME:



1) Perfect harmonic spring?

When a perfect sprig undergoes simple harmonic motion, kinetic energy is converted into potential energy and then back again repeatedly. Because we don't need to consider internal energy for this, we can use TME.