Energy Resources & Transfer

Energy is conserved — it is transferred between stores, never created or destroyed.

Energy stores and transfers

Stores include kinetic, gravitational, elastic, thermal, chemical and nuclear. Energy transfers mechanically, electrically, by heating or by radiation.

$$E_k = \tfrac12 mv^2 \qquad \Delta GPE = mgh$$

Worked example. A $2$ kg ball at $6$ m s⁻¹ has $E_k = \tfrac12 (2)(6^2) = 36$