Double blocks on a incline plane

AI Thread Summary
The discussion focuses on analyzing the forces acting on a pulley in a system with double blocks on an incline. Participants emphasize that only the tension in the rope affects the pulley, while gravitational forces act on the blocks themselves. The correct approach involves vectorially adding the tensions to find the resultant force on the pulley. A reaction force from the bracket supporting the pulley is also considered, which acts in the opposite direction to the resultant tension. The conversation seeks to clarify the magnitude and direction of these forces for accurate calculations.
big_bounce
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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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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?
 
big_bounce said:

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.
 
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...
 
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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Last edited:
The pulley is attached to the top of the triangular structure by bracket. This bracket exerts a reaction force upon the pulley.
 
lewando said:
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:
Right! Numerically, what did you get for the magnitude and direction of FR?
 
Last edited:

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