Double blocks on a incline plane

  • Thread starter big_bounce
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  • #1
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Homework Statement



See attachment (1)

what's forces act on pulley ?
Find direction and magnitude




Homework Equations


F=ma


The Attempt at a Solution


After we find tension in robe , See attachment (2)
what do we work ?
Must decomposes tension to horizontal and vertical vector and after that resultant of the two vectors ? or decomposes m1gsinθ and m2sinθ ?
See attachment (3) and then say is that Correct solution ؟
 

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Answers and Replies

  • #2
Simon Bridge
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All the pulley sees is the tension in the rope.
How many forces does the pulley see?
What is the magnitude of each of those forces?
Which direction does each force act?
What is the total applied force?
 
  • #3
SammyS
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Homework Statement



See attachment (1)

what's forces act on pulley ?
Find direction and magnitude

Homework Equations


F=ma

The Attempt at a Solution


After we find tension in robe , See attachment (2)
what do we work ?
Must decomposes tension to horizontal and vertical vector and after that resultant of the two vectors ? or decomposes m1gsinθ and m2sinθ ?
See attachment (3) and then say is that Correct solution ؟
Please give a complete statement of the problem you're working on.

It seems that you are trying to do more than simply find the forces acting on the pulley.
 
  • #4
5
0
you just add the two tensions vectorially and the answer u get is the correct answer.... Tensions are the only forces acting on the pulley.


m1gsin8 and m2gsin8 will act on the blocks, not on the pulley...
 
  • #5
102
3
We want to calculate forces act on pulley .
So only tension's vectors act on pulley ?

See attachment
Is this correct answer ?
Resultant vector's magnitude and direction is correct ?


In this case F1=F2=T=28.94
 

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  • #6
lewando
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The pulley is attached to the top of the triangular structure by bracket. This bracket exerts a reaction force upon the pulley.
 
  • #7
102
3
The pulley is attached to the top of the triangular structure by bracket. This bracket exerts a reaction force upon the pulley.

And the reaction is equal to FR but in opposite direction , right ?

Please see Upper attachment
 
Last edited:
  • #8
lewando
Homework Helper
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Right! Numerically, what did you get for the magnitude and direction of FR?
 
Last edited:

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