Statics and Dynamics Quiz
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Two blocks, Block 1 (mass m1m_1) and Block 2 (mass m2m_2), are stacked vertically. Block 1 rests on a rough horizontal surface, and Block 2 sits on top of Block 1. A horizontal force PP is applied to Block 2 only. The system is in static equilibrium. The coefficient of static friction between Block 1 and the floor is μ1\mu_1, and between Block 1 and Block 2 is μ2\mu_2.
A student draws an FBD of Block 1 alone. Which of the following correctly lists every distinct external force that must appear on that FBD?
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