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I have a question from a student that I am having difficulty answeringthe
properly.
We are discussing a pully with a string going over it and the string not
slipping
against the pulley with two different masses attached to each end of the
string,
one on each side of the pulley.
I drew the free body diagram of the pulley showing a supporting force at
center and a Tension downward on the left and also one downward on theright
ofnot
the pulley.
The student's comment was "aren't all parts of the string that are in
contact with
the pulley also supplying a torque on the pulley?" In other words, he is
comfortable with the notion of just the two tensions supplying torque buton
feels
there are other torques that need to be included in the net torque acting
the
pulley.
What might be a good response to this concern?
Thanks for the help, David Abineri dabineri@choice.net