<aside> ♻️ Energy is neither created nor destroyed in an isolated system, it can only change form. $E_{Ti} = E_{Tf}$
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$E_{gi} + E_{ki} = E_{gf} + E_{kf}$
Isolated system: a system that cannot interact or exchange energy with external systems; also called a closed system
Open system: a system that can interact with another external system
The rate of work done by a force over time, or the rate at which energy of an open system changes
$P = \frac{W}{t}$, where $W$ is the work done, $P$ is the power (measured in watts), and $t$ is time