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T1=T2 how do i motivate?

  1. Oct 15, 2015 #1
    1. The problem statement, all variables and given/known data

    How do i motivate that T1 = T2 in this system.

    mHxv4Yc.png without just saying "Oh" its the same rope, like more in depth "why"
     
  2. jcsd
  3. Oct 15, 2015 #2

    SteamKing

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    What do you mean by 'motivate'?
     
  4. Oct 15, 2015 #3
    The question is why can we say that t1 = t2 in this problem? Why? What is the reason?:
     
  5. Oct 15, 2015 #4
    By assuming that the rope is massless.
     
  6. Oct 15, 2015 #5
    Why is t1=t2? Has it something to do with newtons third law, u guys dont explain very well sorry..
     
  7. Oct 15, 2015 #6

    SteamKing

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    Well, your diagram is open to some interpretation. Is it a static figure? Is there friction present for the surface on which M rests? Are D and M supposed to have the same mass?

    If you draw a free body diagram which isolates the sheave, you should be able to determine how T1 relates to T2, assuming of course, you can answer the questions posed above.
     
  8. Oct 15, 2015 #7
    .. This dosent help me, just think of a normal pulley problem where T1 is equal to T2, but why? They are equal, but is it because its "one string" or because of "newtons third law" or why? like common, this is a very easy question, but its quite hard if ur teacher havent told you (in this case told me)
     
  9. Oct 15, 2015 #8

    SteamKing

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    Well, the easy answer is it's the same rope. When you pull on one end with a certain amount of force, that same force is transmitted all the way back to the point where the other end of the rope is attached. That's the First Law of Ropes.
     
  10. Oct 15, 2015 #9
    Thanks :)
     
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