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Problem: A box weighing 100N starts to move across a horizontal surface when a horizontal force of 25N is applied to it, but a force of only 20N is needed to keep it moving in uniform motion.
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Question 1: What are the coefficients of static and kinetic friction?
Question 2: If the force is not applied horizontally but in a direction 30 degrees above the horizontal, find the coefficients of static and kinetic friction.
The top surface of an S-shaped aluminum block, shown in Figure, is subjected to a uniform pressure of 20 N/mm2. The bottom is fixed.
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