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Centripetal force is resultant force?

  1. Jul 1, 2015 #1
    1. The problem statement, all variables and given/known data
    I know that centripetal is the resultant force acting to enable the a body to move in a circular path ... But , in the triangle , the R3 looks like the resultant force ..Can someone tell me which is the correct resultant force in this diagram ? What is R3 actually ?

    2. Relevant equations


    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Jul 1, 2015 #2

    SteamKing

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    It's not clear what your scribblings represent in the attached image.

    Please post the entire problem statement for the problem you are trying to solve.
     
  4. Jul 1, 2015 #3
    this is a hand-written note actually .. In this note , we are asked to find the R3 , What is R3 actually ?
     
  5. Jul 1, 2015 #4
    How can one tell what R3 is without knowing the necessary details of the problem? It's like me asking you what's the answer to the question without telling you the question. Please do what SteamKing asked.
     
  6. Jul 1, 2015 #5

    haruspex

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    You seem to think R3 is the resultant force just because it is the hypotenuse of the triangle. There is no such rule.
    FC is clearly marked as the resultant of W and R3 (it's indicated by the double arrow).
    As to what R3 is, there is no way to tell from these notes. Presumably there was some spoken background which you either missed or have failed to relate.

    Edit: is this the same as https://www.physicsforums.com/threads/direction-of-reaction-force-in-a-circular-motion.821487/? Pls don't create two threads for one problem, even if you have multiple questions concerning it.
     
    Last edited: Jul 1, 2015
  7. Jul 1, 2015 #6
    Or the triangle is wrongly drawn, causing me to confuse?
     
  8. Jul 1, 2015 #7

    haruspex

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    I cannot tell from this thread whether the triangle is correctly drawn. I see no reason to suppose it is wrong. Your question suggests to me you are still clinging to the notion that in a right-angled triangle the hypotenuse should be the resultant. Get that notion out of your head.
     
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