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Skill 4 of 8
In Progress

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.

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References:

  1. Get Ready for a Schooling in Angular Momentum’ (web page), Rhett Allain, Wired, 2017, www.wired.com/story/what-is-angular-momentum/ (accessed Mar. 10th, 2020)
  2. Rotation in space’ (web page), Richard P. Feynman and others, The Feynman Lectures on Physics, ch. 20, 1963, updated on website 2010 by Michael A. Gottlieb and Rudolf Pfeiffer, www.feynmanlectures.caltech.edu/I_20.html (accessed Mar. 10th, 2020)
  3. Sears and Zemansky’s Univesity Physics with Modern Physics’ (book), Hugh D. Young & Roger A. Freedman, Pearson Education, 13th ed., 2012