Op) A 1.57 kg block is initially at rest on a horizontal surface. Ahorizontal force F of magnitude 9.68 N and a vertical downward force P arethen applied to the block. The coefficients of friction for the block and surfaceare µs = 0.4 and µk = 0.25. Determine the magnitude of the frictional forceacting on the block if the magnitude of P is (a) 4.71 N and (b) 9.42 N (c) Ifthe force F starts to increase gradually from 0 to 9.68 N Plot the graph forthe friction force vs time for part (a) and (b).

) A 1.57 kg block is initially at rest on a horizontal surface. A horizontal force F of magnitude 9.68 N and a vertical downward force P are then applied to the block. The coefficients of friction for the block and surface are Us = 0.4 and µk = 0.25. Determine the magnitude of the frictional force acting on the block if the magnitude of P is (a) 4.71 N and (b) 9.42 N (c) If the force F starts to increase gradually from 0 to 9.68 N Plot the graph for the friction force vs time for part (a) and (b).

) A 1.57 kg block is initially at rest on a horizontal surface. A horizontal force F of magnitude 9.68 N and a vertical downward force P are then applied to the block. The coefficients of friction for the block and surface are Us = 0.4 and µk = 0.25. Determine the magnitude of the frictional force acting on the block if the magnitude of P is (a) 4.71 N and (b) 9.42 N (c) If the force F starts to increase gradually from 0 to 9.68 N Plot the graph for the friction force vs time for part (a) and (b).

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.3P: Two identical chairs, each weighing 14 lb, are stacked as shown. The center of gravity of each chair...

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