Friction Forces: Maximum Intensity & Acceleration

AI Thread Summary
The discussion focuses on determining the direction of friction forces in a system of blocks and calculating the maximum force (F) before movement occurs. It emphasizes that friction always acts opposite to the direction of potential slipping between surfaces. The coefficients of friction provided in the image are crucial for calculating both the maximum intensity of force and the subsequent acceleration once the blocks start moving. Understanding the mechanics of friction is essential for accurately solving the exercise. Proper analysis of the forces involved will lead to the correct answers for both maximum intensity and acceleration.
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Hi, I need some help with this exercise because I can't figure out where the friction forces point to.Find the maximum intensity possible for F before any of the blocks start moving, and the acceleration that they acquire once they start to move, if F keeps the calculated intensity.There is no friction in the pulley and the rope can not stretch nor shrink. The coefficients of friction between the blocks and with the floor are in the picture.
 
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Friction forces always resist (act opposite to) other forces that are parallel to the plane of friction.
 
Friction opposes slipping between surfaces. So figure out which way the surfaces would slip (with respect to each other) if there were no friction--that will tell you which way the friction must act.
 

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