5.3 Conservation of Energy

- Energy can neither be created nor destrooyed, but only transformed from one kind to another.

PE_max = mgh = max = mv²/2 = KE_max

E_total = PE + KE

E_i = E_f

- The sum of all kinetic and potential eneergy derived by the concept of work is called Mechanical Energy.

- Conservative forces convert potential ennergy into kinetic energy and vice-versa.

ME = PE + KE

ME_i = ME_f

PE_max + KE₀= PE₀ + KE_max

- Nonconservative (dissipative) forces alllow energy to be transferred from the system to other objects.

ME = W_f + KE + PE

Wf = ME - KE - PE

Efficiency =

Work Output Work Input

x 100%