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🪐 万有引力计算器Gravitational Force Calculator
用牛顿万有引力定律 F = G·m₁·m₂/r² 计算两物体间的引力，支持科学计数法（如 5.972e24）。Newton's law of gravitation F = G·m₁·m₂/r² between two masses; scientific notation like 5.972e24 is accepted.
使用说明与常见问题How-to & FAQ
「万有引力计算器」是什么？What is the Gravitational Force Calculator tool?
用牛顿万有引力定律 F = G·m₁·m₂/r² 计算两物体间的引力，支持科学计数法（如 5.972e24）。Newton's law of gravitation F = G·m₁·m₂/r² between two masses; scientific notation like 5.972e24 is accepted.
如何使用「万有引力计算器」？How do I use the Gravitational Force Calculator tool?
在「万有引力计算器」中，填写「质量 m₁ (kg)」、「质量 m₂ (kg)」、「距离 r (m)」等参数，结果会随输入实时计算并显示在下方。In the Gravitational Force Calculator: Fill in "Mass m₁ (kg)", "Mass m₂ (kg)", "Distance r (m)"; results are recalculated instantly as you type.
引力常数 G 取多少？What value of G is used?
G = 6.67430 × 10⁻¹¹ N·m²/kg²（CODATA 2018 推荐值）。G = 6.67430 × 10⁻¹¹ N·m²/kg² (CODATA 2018).
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「万有引力计算器」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 Gravitational Force 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.
「万有引力计算器」免费吗？需要注册吗？Is the Gravitational Force Calculator free? Do I need an account?
「万有引力计算器」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 Gravitational Force 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.