Kinesiology 2241A/B Lecture Notes - Lecture 21: Moment Of Inertia, Angular Velocity, Gyroscope

A 2.00-kg rock has a horizontal velocity of magnitude 12.0 m/s when it is at point P in the figure. (a) At this instant, what are the magnitude and direction of its angular momentum relative to point O? (b) If the only force acting on the rock is its weight, what is the rate of change (magnitude and direction) of its angular momentum at this instant?

If a gyroscope with I=0.265kgm2 with an initial angular velocity of 1250RPM takes 3.00 minutes to come to rest, what is the magnitude of the rotational torque? If the contact between the rotating object and the frame in which it is held is 0.5mm from the axis of rotation, what is the effective frictional force?