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Kinetic energy is the energy possessed by an object due to its motion. It depends on both mass and the square of velocity — doubling speed quadruples kinetic energy, while doubling mass only doubles it. KE is the work-energy theorem in action: the net work done on an object equals the change in its kinetic energy.

공식

KE = ½mv² (joules, J)

KE: ½mv² (joules — ½mv² (joules
J: J value — Variable used in the calculation

단계별 가이드

1KE = ½mv² (joules, J)
2m = mass in kg, v = velocity in m/s
3Momentum p = mv (kg⋅m/s) — conserved in collisions
4Work done to bring to rest = KE (e.g. braking distance calculation)
5KE is scalar (no direction); momentum is a vector

풀어진 예시

입력

70 kg person running at 10 m/s (36 km/h)

결과

KE = ½ × 70 × 100 = 3,500 J

Equivalent to lifting ~350 kg by 1 metre

입력

1,500 kg car at 30 m/s (108 km/h)

결과

KE = 675,000 J = 675 kJ

Explains why speeding is so dangerous

입력

0.006 kg bullet at 900 m/s

결과

KE = 2,430 J — more than a running person

자주 묻는 질문

What is Kinetic Energy Calc?

How accurate is the Kinetic Energy Calc calculator?

The calculator uses the standard published formula for kinetic energy calc. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Kinetic Energy Calc calculator use?

This calculator works with kilograms, inches, watts. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Kinetic Energy Calc calculator use?

The core formula is: KE = ½mv² (joules, J). Each step in the calculation is shown so you can verify the result manually.

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