A long, uniform rod of length L and mass M is pivoted about a frictionless, horizontal pin through one end. The rod is nudged from rest in a vertical position as shown in figure. At the instant the rod is horizontal, find (a) its angular speed
Since angular speed is the same throughout a rigid object, can't I just use the conservation of energy equation and solve for w? There is an example similar to this question in my text-book, but they found the angular speed at the center of mass. Why did they do that? Why is the center of mass being used so often in rotational motion?