A 100 kg block on an inclined plane is released from rest (see Figure 3.1); assume there is friction between the block and the inclined plane, with kinetic friction coefficient μk=0.1: (i) calculate its velocity at the time the block has covered a distance of 2 m. (ii) Calculate the time the block takes to cover the distance of 2 m. State and justify your assumptions and comment on your solutions. 100 kg 60° Figure 3.1

A 100 kg block on an inclined plane is released from rest (see Figure 3.1); assume there is friction between the block and the inclined plane, with kinetic friction coefficient μk=0.1: (i) calculate its velocity at the time the block has covered a distance of 2 m. (ii) Calculate the time the block takes to cover the distance of 2 m. State and justify your assumptions and comment on your solutions. 100 kg 60° Figure 3.1

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 7.78P: The figure shows a steel bar being processed by a rolling mill. Given that P=80kN and r =0.016,...

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(II) A 25.0-kg box is released on a 27° incline and accelerates down the incline 0.30 m/s2at Find the friction force impeding its motion. What is the coefficient of kinetic friction?
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An 90.17 kg person is half way up a uniform ladder of length 3.939 m and mass 29.49 kg that is leaning against a wall. The angle between the ladder and the wall is 0. The coefficient of static friction between the ladder and the floor is 0.2881. Assume that the friction force between the ladder and the wall is zero. What is the maximum value of the angle between the ladder and the wall before the ladder starts slipping?
Q5 A pull of 20 N at 30 ° to the horizontal is necessary to move a block of wood on a horizontal table . If the coefficient of friction between the bodies in contact is 0.25 , what is the weight of the block ?
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