Kinetic Energy Calculator
Calculate kinetic energy (KE = ½mv²) for any mass and velocity, with joules and foot-pounds output.
Kinetic energy (J)
3,500
Breakdown
- Kilojoules (kJ)
- 3.50
- Foot-pounds (ft·lb)
- 2,581.47
- Velocity (mph)
- 22.40
Last updated:
FAQ
Why does doubling speed quadruple energy?
KE = ½mv² is quadratic in velocity. A crash at 60 mph carries 4× the energy of 30 mph, not 2× — the core physics behind speed limits.
Kinetic vs potential energy — what is the difference?
Kinetic is energy of motion (½mv²); potential is stored energy of position (mgh). Pendulums, falling objects and roller coasters trade one for the other.
How much energy does a bullet carry?
A 9 g bullet at 380 m/s carries about 650 J — like dropping a 1 kg mass from 65 m, concentrated into a tiny point.
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