Solving Mechanics Problems: Friction and Equations | Homework Help

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The discussion focuses on solving a mechanics problem involving friction and the application of equations. The user is uncertain about which type of friction to consider for an inner object and is struggling with the equations used. Participants suggest drawing separate free body diagrams for each block to clarify the forces acting on them, including gravitational and frictional forces. They emphasize the importance of understanding the interaction forces between the blocks and the wall. The conversation highlights the need for clear visualization and understanding of equilibrium in mechanics problems.
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Homework Statement


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Homework Equations


Now i was wondering which friction would come into play for the inner object

The Attempt at a Solution


I tried putting in equations i know

Σ μℕ = μ1f + μ2 f

Am i right. I don't think i am because the values i get after solving it are wrong

I would be glad to share more
 
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Draw a separate free body diagram for each block. Which way are the forces on the block adjacent to the wall?
 
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So is this right
 

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sidt36 said:
So is this right
No, do not add the forces, draw a free body diagram for each body individually. For example, draw body A and then show all the forces on it, including the gravitational force, frictional force on left side (with the wall) and frictional force on the right side (with the body B). Then solve for equilibrium.
 
Sorry i don't understand. I don't get it the addition forces can u explain(please bear with i just entered high school)
 
sidt36 said:
Sorry i don't understand. I don't get it the addition forces can u explain(please bear with i just entered high school)
When one body exerts a force on another, there is an equal and opposite reaction.
Which forces operate where the two blocks meet? For each such force, there should be force one way in one diagram and an equal and opposite force in the other diagram.
 
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