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Question on circular motion and newton's laws

  1. Oct 29, 2007 #1
    1. What are the action/reaction forces when twirling a rubber stopper attached to a string? How does circular motion illustrate newton's first law?



    2. F=ma



    3. I thought about centripetal and centrifugal, but my teacher said centrifugal force isnt a real force.
     
  2. jcsd
  3. Oct 29, 2007 #2

    PhanthomJay

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    Your teacher of course is correct. When you talk of 'action/reaction' forces, you're talking usually about Newton's 3rd Law 'force pairs', whereby if A exerts a force on B, then B exerts a force on A that is equal in magnitude but opposite in direction to it. Does that help?
     
  4. Oct 29, 2007 #3
    yea, but i can only think of the tension force, i cant think of the opposite to that. how about the force applied by the hand and the tension force?
     
  5. Oct 29, 2007 #4

    PhanthomJay

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    Yes, that's one of them. If the hand pulls on the string creating a force in the string, then what can you say about the force of the string on the hand? What about the stopper/string force pair?
     
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