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phys: mechanical energy definition

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@ -465,7 +465,7 @@ $$\Delta E_e = \frac{1}{2}k \Delta x^2$$
### Conservation of energy
The law of conservation of energy states that mechanical energy in a **closed system** remains constant. Therefore, the net energy initially must be the same in the end.
The law of conservation of energy states that mechanical energy (the total kinetic and potential energies) in a **closed system** remains constant unless any dissipative forces (such as friction) are present. Therefore, the net energy initially must be the same in the end.
$$\Sigma E_i = \Sigma E_f$$
The types of energy involved may have varying values as long as their sum is fixed. **Work** determines how energy is distributed among the types of energy.