T1=T2 how do i motivate?

  • Thread starter Optikspik
  • Start date
  • #1
23
0

Homework Statement



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"
 

Answers and Replies

  • #2
SteamKing
Staff Emeritus
Science Advisor
Homework Helper
12,796
1,667
What do you mean by 'motivate'?
 
  • #3
23
0
The question is why can we say that t1 = t2 in this problem? Why? What is the reason?:
 
  • #4
380
7
The question is why can we say that t1 = t2 in this problem? Why? What is the reason?:
By assuming that the rope is massless.
 
  • #5
23
0
Why is t1=t2? Has it something to do with newtons third law, u guys dont explain very well sorry..
 
  • #6
SteamKing
Staff Emeritus
Science Advisor
Homework Helper
12,796
1,667
Why is t1=t2? Has it something to do with newtons third law, u guys dont explain very well sorry..
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.
 
  • #7
23
0
.. 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)
 
  • #8
SteamKing
Staff Emeritus
Science Advisor
Homework Helper
12,796
1,667
.. 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)
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.
 
  • #9
23
0
Thanks :)
 

Related Threads on T1=T2 how do i motivate?

Replies
1
Views
2K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
4
Views
5K
  • Last Post
Replies
2
Views
6K
Replies
2
Views
5K
  • Last Post
Replies
1
Views
2K
Replies
29
Views
4K
  • Last Post
Replies
1
Views
427
  • Last Post
Replies
7
Views
15K
Replies
3
Views
2K
Top