Solving a Static and Kinetic Friction Problem

AI Thread Summary
The discussion revolves around solving a physics problem involving two boxes connected by a pulley, with specific masses and coefficients of friction. The key points include understanding when to apply static versus kinetic friction; static friction applies when the system is at rest, while kinetic friction is used once the system is in motion. For part (a), participants are encouraged to analyze the forces acting on both boxes to determine the net force and subsequently the acceleration when the system is released. The confusion arises from the dual coefficients of friction, highlighting the need for clarity in applying the correct values based on the system's state. The thread emphasizes the importance of identifying all forces involved to solve for acceleration accurately.
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Homework Statement


In the following figure(one box on a table, m1, connected to a string that is on a pulley attached to box m2), m1=10kg and m2=4kg. The coefficient of static friction between m1 and the horizonatl surface is 0.50 while the coefficient of kinetic friction is 0.30. (a) If the system is released from rest, what will its acceleration be? (b) If the system is set in motion with m2 moving downward, what will be the acceleration of the system?


Homework Equations


Fnet=ma


The Attempt at a Solution


I've only done problems with a single friction or coefficient of friction given and I don't understand how to use kinetic or static. I've never worked with them before so I have no idea on how to go about this.
 
Physics news on Phys.org


The static coefficient is used to calculate the force of friction when there is no motion, if things are moving you use the kinetic coefficient to calculate friction. For part (a) what are all the forces on the two boxes?
 
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