Question about Newton's second law

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Homework Help Overview

The discussion revolves around a physics problem involving Newton's second law, specifically focusing on the interaction between two blocks with friction. The scenario includes calculating coefficients of friction and analyzing forces acting on the blocks.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants are considering how to approach the problem, with some expressing uncertainty about the dynamics of stacked objects and the role of friction. There is a suggestion to draw diagrams to aid understanding.

Discussion Status

Some participants have offered guidance by suggesting the use of diagrams, while others are still grappling with the fundamental concepts involved in the problem. Multiple interpretations of the problem setup are being explored.

Contextual Notes

There is a hint provided regarding the relationship between the blocks' accelerations and the maximum static friction, which may influence how participants approach the problem. The original poster's request for help indicates a lack of clarity on the topic.

Elclon
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A 4.0 kg block is put on top of a 6.0 kg block. In order to cause the top block to slip on the bottom one when the latter is held fixed, a horizontal force of 12N must be applied to the top block to overcome the maximum static friction. The coefficient of kinetic friction for all contact surfaces is 0.25.
(a) Find the coefficient of static friction between the two blocks.
(b) Find the maximum horizontal force F that can be applied to the lower block so the blocks will move together. (Hint: In this situation, the two blocks still have the same acceleration, while the block on top receives maximum available static friction.) Please draw a free body diagram for each block.
(c) If the horizontal force on the lower block is twice the maximum value calculated in (b) above, draw a free body diagram for each block, and find the accelerations of each block.
 
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How would you think to approach the problem?
 
I don't even have a clue when dealing with one object is being put on top of another object. Is there anyone who can help me to solve that?
 

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