How can I keep the smaller block from slipping down the larger block?

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Homework Help Overview

The problem involves two blocks, one smaller (m = 14 kg) and one larger (M = 100 kg), where the smaller block is positioned against the larger block on a flat surface. The challenge is to determine the minimum horizontal force required to prevent the smaller block from slipping down the larger block, given that the coefficient of static friction between them is μs = 0.28 and the surface beneath the larger block is frictionless.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the orientation of the blocks and clarify the setup, questioning the meaning of the smaller block "slipping down" the larger block. There are suggestions to visualize the forces acting on the smaller block and to identify relevant forces and equations.

Discussion Status

The discussion is ongoing, with participants seeking clarification on the problem setup and exploring the forces involved. Some guidance has been offered regarding visualizing the problem and identifying key forces, but no consensus or resolution has been reached yet.

Contextual Notes

Participants express frustration regarding the lack of relevant examples in lectures, which may impact their ability to approach the problem effectively.

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Homework Statement


The two blocks (m = 14 kg and M = 100 kg) in Fig. 6-39 are not attached to each other. The coefficient of static friction between the blocks is μs = 0.28, but the surface beneath the larger block is frictionless. What is the minimum magnitude of the horizontal force required to keep the smaller block from slipping down the larger block?



Homework Equations



no idea

The Attempt at a Solution



Couldn't attempt anything because I don't know where to began and the horrible Haliday text doesn't help me.
 
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Can you describe the orientation of the blocks a little better. Are they on the level or on an incline? What do you mean by the smaller block slipping down the larger block?
 
its a flat surface with block M on the gound at rest and block m pushing against it, but block m isn't on the ground. the friction is between block M and m. its pushing against M on the left side. I have no idea why my teacher assigns us to do homework when his lectures never cover any examples like these problems he gives us...
 
oscarkool2 said:
its a flat surface with block M on the gound at rest and block m pushing against it, but block m isn't on the ground. the friction is between block M and m. its pushing against M on the left side. I have no idea why my teacher assigns us to do homework when his lectures never cover any examples like these problems he gives us...

Ahh, what a cool problem! Draw yourself a picture of just the small block and identify the force on it. Two questions: (1) What force keeps the block from falling? (2) What is the equation that tells you the magnitude of that force?

Answer those questions and I'll give you the next hint.
 

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