Problem_Sheet_6

# Problem_Sheet_6 - GE 208K Chapter 6 Problem Sheet 6 1 A...

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GE 208K: Chapter 6 Problem Sheet 6 1. A 25.0 kg block is initially at rest on a horizontal surface. A horizontal force of 75.0 N is required to set the block in motion. After it is in motion, a horizontal force of 60.0 N is required to keep the block moving with constant speed. Find the coefficients of static and kinetic friction. 2. Two blocks of mass 12.0 kg and 18.0 kg are connected by a rope of negligible mass. They are dragged by a horizontal force F of 68.0 N. The coefficient of kinetic friction between each block and the surface is 0.100. Determine the tension T and the magnitude of the acceleration of the system. 3. A block weighing 75.0N rests on a plane inclined at 25 ° to the horizontal. A force F is applied to the object at 40.0 ° to the horizontal, pushing it upward on the plane. The coefficient of static and kinetic friction between the block and the plane are respectively, 0.363 and 0.156. a. What is the minimum value of F that will prevent the block from slipping down the plane?

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