Torque

Core Sentence / 核心句

Torque measures the turning effect of a force about a chosen axis.
$\vec{\tau }=\vec{r}\times \vec{F},\tau =F\ell$
$\ell$ 是轴到 force line of action 的垂直距离。

Watch Out / 易错点

torque 依赖 axis；力不为零时 torque 仍可为零。

Mentioned In / 出现位置

• 第9次正课 · torque

Connected Notes / 连接

• Rotational Equilibrium
• Angular Momentum
• Magnetic Torque on a Current Loop