# Kinetic Energy

Written by Jerry Ratzlaff. Posted in Fluid Mechanics

Kinetic energy is the energy in moving objects or mass. If it moves, it has kinetic energy.

## formula

$$KE = \frac {1}{2} m v^2$$ (Translational Kinetic Energy)

$$KE = \frac {1}{2} I w^2$$ (Rotational Kinetic Energy)

$$KE = \frac {P^2}{2m}$$

Where:

$$KE$$ = kinetic energy

$$m$$ = mass

$$v$$ = velocity

$$I$$ = moment of inertia

$$w$$ = angle of speed

$$P$$ = power

Solve for:

$$m = \frac {2 KE}{v^2}$$

$$v = \sqrt { \frac {2 KE}{m} }$$