How do you find the torque of friction? How does having a massive pulley change how we solve pulley problems?

posted Oct 28, 2017, 1:24 PM by Barbara Fortunato   [ updated Nov 2, 2017, 5:30 AM ]
2: T 10/31, 4: W 11/1
 
Today, we'll do a lab where we try to find the torque of friction on the aluminum disk mounted on the wall.  This activity will require you to put together all of the pieces of rotational dynamics that we've been working with in the past couple weeks.  

Massive Pulley Lab Requirements:
  • Large diagram of set-up with labeled measured distances
  • Free body diagrams of pulley and falling mass  (make sure ALL forces are represented, remember that normal force and force of friction are components of the same force of contact)
  • Calculations to find the torque of friction (kinetic)
  • Reason that the torque of friction is easier to find than the force of friction (or what we would need to measure in order to find the force of friction)

If there's time after the lab, we'll learn how to solve "massive pulley problems".  We'll do these problems from Chapter 10:

    Required:  31, 32, 33, 36, 37, 40, 101, 102
    Enrichment:  35, 41

HomeworkStudy for an open lab-notebook quiz next class - Thursday, November 2nd - pertaining to the lab we did today.  

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