Calculadora de Energia Cinética
Calcule a energia cinética a partir da massa e velocidade, massa a partir de energia e velocidade, ou velocidade a partir de energia e massa (KE = ½mv²), com seletores de unidade para J, kJ, MJ, cal, kcal, Wh, kWh, eV, BTU, ft·lb e unidades comuns de massa e velocidade.
Entrada
Quaisquer dois de energia, massa e velocidade determinam o terceiro.
Saída
| Quantity | Value | Other units |
|---|---|---|
| No data yet | ||
Mais formas de usar esta ferramenta
API REST
curl -X POST https://api.iotools.cloud/v1/tool/kinetic-energy-calculator \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"solveFor": "energy",
"energy": "9",
"energyUnit": "j",
"mass": "2",
"massUnit": "kg",
"velocity": "3",
"velocityUnit": "ms"
}'Troque pela sua própria chave, da sua conta. Os campos da ferramenta viram o corpo da requisição — sem envelope.
Peça a um agente de IA
Use the IOTools `kinetic-energy-calculator` tool (Kinetic Energy Calculator) on this input:
YOUR_INPUT_HERECole isto em qualquer agente conectado ao servidor MCP do IOTools e depois adicione sua entrada.
Widget para incorporar
<iframe
src="https://iotools.cloud/embed/kinetic-energy-calculator/"
width="100%" height="520" frameborder="0" scrolling="no" loading="lazy"
title="Calculadora de Energia Cinética — iotools.cloud"
sandbox="allow-scripts allow-forms allow-same-origin allow-downloads allow-popups allow-popups-to-escape-sandbox"
allow="clipboard-write"
style="width:100%;border:1px solid #e5e7eb;border-radius:12px;overflow:hidden"></iframe>
<script src="https://iotools.cloud/embed.js" async></script>Coloque isso na sua própria página — grátis, sem chave, só um link de volta.
| Custo por chamada de API/MCP | A partir de 5 créditos |
|---|---|
| Precisa de mais créditos? | Ver preços |
Também disponível via
Guias
The Kinetic Energy Calculator solves KE = ½mv² — kinetic energy, mass, or velocity — pick the quantity you're missing, supply the other two, and it converts between J, kJ, MJ, cal, kcal, Wh, kWh, eV, BTU, ft·lb, and the common mass and velocity units along the way.
The formula
E = ½ × m × v²where E is kinetic energy, m is mass, and v is velocity. Rearranged for the other two quantities:
m = 2 × E ÷ v²
v = √(2 × E ÷ m)How to use it
- Pick what you want to Solve For — Kinetic Energy, Mass, or Velocity.
- Fill in the other two fields, each with its own unit picker: J, kJ, MJ, cal, kcal, Wh, kWh, eV, BTU, and ft·lb for energy; kg, g, mg, lb, oz, metric tons, and US (short) tons for mass; m/s, km/h, mph, ft/s, and knots for velocity.
- The result shows the solved value in every supported unit at once, so you don't need to run the calculator again just to see the same figure in kcal instead of joules.
Example
A 2 kg object moving at 3 m/s:
E = ½ × m × v² = ½ × 2 kg × (3 m/s)² = 9 JWhy does kinetic energy grow with the square of velocity?
Doubling an object's speed quadruples its kinetic energy, not just doubles it — that's why braking distance and crash severity rise so sharply with speed. A car going 60 mph carries four times the kinetic energy of the same car at 30 mph, not twice.
What's the difference between kinetic and potential energy?
Kinetic energy is the energy of motion (½mv²); potential energy is stored energy from position or state (like gravity or a stretched spring). A falling object trades potential energy for kinetic energy as it speeds up.
Privacy
All calculations run entirely in your browser. Your figures are never uploaded or stored.