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Forces acting on object hanging from rearview mirror

  1. Nov 22, 2009 #1
    A string is hanging from the rearview mirror of you car and a ball is at the end of this string. Suppose that you drive around a circular track at fixed speed. Which list below gives all the forces that act on the ball?

    A) tension and the force of gravity
    b) tension force of gravity and centripetal force
    c) tension force of gravity and friction
    d) tension only
    I believe the answer is c, is this correct?
  2. jcsd
  3. Nov 23, 2009 #2
    No. Why should there be friction? There is no contact of the ball with anything that has
    a different speed.
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