## 2 thoughts on “5.31”

1. Abdel Youssef says:

To get the angle, for the equation of the normal force, why did you substitute theta_dotdot with theta_dot^2.
20:40

1. tutorpaul says:

Sorry, that is probably just my careless handwriting. The equation written actually uses $\dot \theta ^2$, although you might have to zoom in to see it; the whole equation is reproduced below.