Angular momentum

• We have linear position $\vec s$, velocity $\vec v$ and acceleration $\vec a$ as well as their equivalent angular position $\vec \theta$, angular velocity $\vec \omega$ and angular acceleration $\vec \alpha$.
• Also, we have linear force $\vec F$ and the equivalent angular version called torque $\vec \tau$.
• It naturally makes sense apart from the linear momentum $\vec p$ to also have an angular momentum. Let’s pick the symbol $\vec L$ for it.

Just like it is tougher to catch than to carry a tomato, it is likewise tougher to grab and stop the out-of-control well-bucket handle than to simple hold it still.