Question

18. In the previous problem, as the rod swings down freely from its initial position to the vertical position, what happens to the magnitude of the angular acceleration a and the magnitude of the angular velocity w? A lo increases and increases B. Jolstays constant and increases c la decreases and increases D la decreases and w decreases E la stays constant and (w stays constant

Answer 1

While falling down from initial position to vertical position, the angle is decreasing, therefore net torque decreases, which causes angular acceleration to decrease.

While falling, the potential energy decreases, which causes increase of rotational kinetic energy, which therefore increases angular speed.

Answer (C)