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🎱 动量计算器Momentum Calculator
p = m·v：输入任意两项求第三项（留空要求的那一项），并给出动能。p = m·v: enter any two of momentum, mass and velocity (leave the unknown blank) to solve the third, with kinetic energy.
使用说明与常见问题How-to & FAQ
「动量计算器」是什么？What is the Momentum Calculator tool?
p = m·v：输入任意两项求第三项（留空要求的那一项），并给出动能。p = m·v: enter any two of momentum, mass and velocity (leave the unknown blank) to solve the third, with kinetic energy.
如何使用「动量计算器」？How do I use the Momentum Calculator tool?
在「动量计算器」中，填写「动量 p (kg·m/s)」、「质量 m (kg)」、「速度 v (m/s)」等参数，结果会随输入实时计算并显示在下方。In the Momentum Calculator: Fill in "Momentum p (kg·m/s)", "Mass m (kg)", "Velocity v (m/s)"; results are recalculated instantly as you type.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「动量计算器」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The Momentum Calculator uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「动量计算器」免费吗？需要注册吗？Is the Momentum Calculator free? Do I need an account?
「动量计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Momentum Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.