checkpoint 1

units/mechanics/unit-3.tex

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+\section{Work, Energy, and Power}
+
+In this unit, we develop the energy viewpoint for mechanics. We begin with work as the accumulated effect of a force acting through a displacement, using the line-integral form $W=\int \vec{F}\cdot d\vec{r}$ as the calculus backbone and then connecting net work to changes in kinetic energy $K$.
+
+We then shift to conservative forces and potential energy $U$, which lets us track mechanical energy with $E_{\mathrm{mech}}=K+U$. With that accounting framework in place, we finish by defining power $P$ as the rate at which energy is transferred or transformed. The emphasis throughout stays on AP-level mechanical energy, including one-dimensional potential-energy graphs and clear bookkeeping of energy changes.
+
+\input{concepts/mechanics/u3/m3-1-work.tex}
+
+\input{concepts/mechanics/u3/m3-2-work-energy.tex}
+
+\input{concepts/mechanics/u3/m3-3-potential-energy.tex}
+
+\input{concepts/mechanics/u3/m3-4-energy-conservation.tex}
+
+\input{concepts/mechanics/u3/m3-5-power.tex}