Rotational Kinetic Energy Calculator
Works out the energy stored in rotation.
Rotational kinetic energy
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Angular velocity — rad/s
Energy from moving along —
Total kinetic energy —
The formula
KE = ½ I ω² total = ½ I ω² + ½ m v²
I is the moment of inertia and ω the angular velocity in rad/s.
What to watch out for
A wheel rolling without slipping has both kinds of energy, with ω = v ÷ r.
Frequently Asked Questions
How much energy is in a 0.5 kg·m² flywheel at 3,000 rpm?
24.67 kJ.
What happens if rpm doubles?
Energy goes up four times, to 98.7 kJ for that flywheel.