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Contact forces. (A) Case 1. A force F is applied to object A, which is in contact with object B. (B) Free-body diagrams for objects A and B arranged as in case 1. (C) Case 2. N objects of type A are in contact with object B, each with a force F applied to it. (D) Free-body diagrams for each object of type A as well as type B for case 2.
