
Concept explainers
Consider the following discussion between two students.
Student 1: “System A and system 3 are pushed by the same force as before, so they will have the same motion as in section I”
Student 2: “I disagree. I think that they are speeding up since friction is less. So now system A is pushing on system B with a greater force than system B is pushing on system A.”
With which student, if either, do you agree? Explain your reasoning.

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