What is the minimum force needed to make a brick topple in a moving train?

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Homework Help Overview

The problem involves a brick placed on a level floor inside a moving train, specifically examining the conditions under which the brick will topple when the train brakes suddenly. The subject area includes concepts from dynamics and static friction.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the relationship between normal force and friction, questioning how to calculate the torque needed for the brick to topple. There are inquiries about the role of fictitious forces in the analysis.

Discussion Status

Some participants have expressed uncertainty about the calculations involved, while others have indicated they reached a resolution after considerable effort. There is a mention of identifying the axis of rotation and summing torques, suggesting some productive direction in the discussion.

Contextual Notes

Participants are navigating the complexities of static friction and torque without sliding, and there are references to specific values and conditions that may not be fully detailed in the discussion.

Omar.Castillo
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A brick of mass 50 g is placed on a level floor inside a moving train. The dimensions of the brick is 10cm*8.0cm*6.0cm. It is placed with one of its 10cm*6cm faces on the floor so that the 6.0 cm edges are parallel to the direction of motion. The train is braked suddenly. Assume that the floor is rough enough to prevent sliding, but allow the brick to topple about a 10cm edge. Find the minimum couple required to makethe brick topple about the 10 cm edge?

I know that the coefficient of static friction is proportional to the normal force. So must I equal the normal force to the coefficient of kinetic friction to get the answer?

After that question the next one is to find the minimum decelaration of the train that makes the brick topple about the 10 cm edge. and determine the minimum value of the coefficient of static friction between the brick and the floor that prevents the sliding
 
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I cannot imagine how to get the torque force without using fictional forces any way to get it without it?
 
Got it

Never mind guys I finally got it after hard 3 hour work, thanks anyway for at least looking at it
 
All you do is identify the axis of rotation (the front edge!)
and sum the torques around that axis.
 

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