運動エネルギー計算機
質量と速度から運動エネルギーを計算するか、エネルギーと速度から質量を計算するか、エネルギーと質量から速度を計算します (KE = ½mv²)。J、kJ、MJ、cal、kcal、Wh、kWh、eV、BTU、ft·lbおよび一般的な質量と速度の単位を選択できます。
入力
エネルギー、質量、速度の内、任意の2つが分かれば3つ目が決まります。
出力
| Quantity | Value | Other units |
|---|---|---|
| No data yet | ||
このツールを使う他の方法
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"
}'ご自身のアカウントのキーに差し替えてください。ツールのフィールドがそのままリクエストボディになります——ラッパーはありません。
AIエージェントに依頼する
Use the IOTools `kinetic-energy-calculator` tool (Kinetic Energy Calculator) on this input:
YOUR_INPUT_HEREIOTools MCPサーバーに接続された任意のエージェントにこれを貼り付け、入力内容を追加してください。
埋め込みウィジェット
<iframe
src="https://iotools.cloud/embed/kinetic-energy-calculator/"
width="100%" height="520" frameborder="0" scrolling="no" loading="lazy"
title="運動エネルギー計算機 — 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>ご自身のページに貼り付けるだけ——無料、キー不要、リンクを掲載するだけです。
| API/MCP 1回あたりの費用 | 5クレジットから |
|---|---|
| クレジットが足りませんか? | 料金を見る |
次の方法でも利用可能
ガイド
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.