**Kinetic energy** (symbol KE, measured in Joules) is the energy which any moving object has due to its motion. In classic physics, the formula for the kinetic energy of a moving object it

- $ E_k = \frac{1}{2} m v^2 $

In rotational systems, it is equal to one half of the moment of inertia (*I*) times the angular velocity (*ω*) squared.

- $ E_r = \frac{1}{2} I \omega ^ 2 = \frac{1}{2} L \omega $

The kinetic energy of a falling body when it strikes the ground is equal to its potential energy at the height from which it was dropped.