Lesson: Conservation of Angular Momentum
In this lesson, we will learn how to calculate the variation of the moment of inertia of a rotating body with its angular velocity.
Sample Question Videos
Worksheet: 25 Questions • 1 Video
A merry-go-round has a mass of 110 kg and a radius of 1.30 m. The merry-go-round is rotating with an angular speed of 0.25 rev/s. A child of mass 25 kg, initially at rest, grabs the outer edge of the merry-go-round and begins to rotate with it. What is the angular speed of the merry-go-round after the child gets on?
A disk has a mass of 3.6 kg and a radius of 65.0 cm. A small object of mass 0.42 kg is attached to the rim of the disk. The disk is rotating at 3.0 rev/s when the small object separates from the disk. What is the disk’s rotation rate after the small object separates?
What is the angular speed of the coupled cylinders?
What percentage of the cylinders’ original kinetic energy is lost to friction during coupling?