HELP A horizontal disk is spinning freely on a frictionless axle with a constant angular velocity. A lump of sticky clay is dropped from above directly onto the edge of the disk, as shown in the diagram above.

The clay sticks to the disk, causing the angular velocity of the disk to decrease. Explain why the disk slows down when the clay lands on it using the concept of torque and Newton’s Third law (hint: think about what role friction plays).