动能计算器
根据质量和速度计算动能，根据能量和速度计算质量，或根据能量和质量计算速度（KE = ½mv²），支持J、kJ、MJ、cal、kcal、Wh、kWh、eV、BTU、ft·lb以及常见质量和速度单位的单位选择。
输入
能量、质量和速度中的任意两个可以确定第三个。
输出
| Quantity | Value | Other units |
|---|---|---|
| No data yet | ||
使用此工具的更多方式
REST API
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"
}'替换成您账户中的密钥。工具的字段即为请求体——没有额外包装。
让 AI 代理执行
Use the IOTools `kinetic-energy-calculator` tool (Kinetic Energy Calculator) on this input:
YOUR_INPUT_HERE将此粘贴给任何已连接 IOTools MCP 服务器的代理,再加上您的输入内容。
嵌入式小组件
<iframe
src="https://iotools.cloud/embed/kinetic-energy-calculator/"
width="100%" height="520" frameborder="0" scrolling="no" loading="lazy"
title="动能计算器 — 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>把它放到您自己的页面上——免费,无需密钥,只需保留一个反向链接。
| 每次 API/MCP 调用费用 | 5 积分起 |
|---|---|
| 需要更多积分? | 查看定价 |
也可通过
使用指南
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.