2. In this experiment, we will gradually add very small masses to the mass hange

Question

2. In this experiment, we will gradually add very small masses to the mass hanger and give the disk a small push to overcome static friction, and to start the disk turning, in the direction that causes the mass hanger to fall. Capstone will measure the linear velocity of the string and plot this velocity versus time. The acceleration due to gravity times the mass on the end of the string (hanger plus added masses) is the force acting to accelerate the disk. We will keep adding mass to the hanger until when we give the disk a small push the disk turns at a constant angular velocity without accelerating. We know the force on the mass and hanger that is trying to accelerate the disk. If the disk is not accelerating, but turning at a constant velocity, what additional force on the disk do we now know the value of? What is this additional force equal to?

Explanation / Answer

Assuming the pulley is frictionless; the force that is equal and opposite to the force of gravitation on the mass hanger is the force of friction on the axis of the disk.

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