How Does Configuration Affect Frictional Forces on Identical Blocks?

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The discussion revolves around the frictional forces acting on identical blocks with equal mass and material composition, all subjected to the same velocity. Participants debate whether the frictional force is the same across different configurations of the blocks, specifically comparing setups A, B, and C. It is noted that configurations B and C differ only in the arrangement of the blocks—one stacked and one side by side—but both are pulled by the same string. The conclusion drawn is that the frictional force remains consistent for configurations B and C due to their similar conditions. Overall, the frictional forces in configurations A, B, and C are analyzed with an emphasis on their equal mass and material properties.
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The blocks shown have equal mass and are made of the same material,and the velocity is the same in each figure. The total frictional force on the blocks are

A. Greater in C than in A or B
B. The same in C and A
C. The same in A,B, C
D. The same in A and B
E. The same in C and B.

Isnt the fictional force the same for all B and C since the only difference between them is that in B the two masses are on top of one another and being pulled be a string, and in C the two masses are beside each other and attached to the same string, which is being pulled?
 

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StephenDoty said:
Isnt the fictional force the same for all B and C since the only difference between them is that in B the two masses are on top of one another and being pulled be a string, and in C the two masses are beside each other and attached to the same string, which is being pulled?
Right.
 

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