1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Why is torque switching?

  1. Mar 20, 2013 #1
    In the attached picture, one sees a pulley with a mass which is holding two different weights. In chegg, the tension due to a weight is represented as a downward direction. Then, when the tension is working on the pulley, the directions switch. WHY IS THIS?!


    Last edited: Mar 20, 2013
  2. jcsd
  3. Mar 20, 2013 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Tension forces always pull away from the objects on which they act. The cable tension force on the mass acts up. The cable tension force on the pulley acts down.
  4. Mar 20, 2013 #3
    Tension and the force/load/weight always act opposite in direction. Think of tension as a load that balances the weight.
    So when the tension is due to the mass m1 (which directs weight downwards) it is in the upper direction which will take a U-turn after the pulley.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted