Work and Conservation of Energy
$$W = F \cdot s \cos\theta \quad (\text{SI Unit: Joule, J})$$
- Kinetic Energy: $E_k = \frac{1}{2}mv^2$
- Potential Energy: $E_p = mgh$
- Law of Conservation of Energy: Total mechanical energy ($E_k + E_p$) of an isolated system remains constant.
- Power: $P = \frac{W}{t}$ (SI Unit: Watt, $1\text{ W} = 1\text{ J/s}$; $1\text{ HP} = 746\text{ W}$).
