1. A force of 69N is needed to start an 6.9kgbox moving across a horizontal surface.Calculate the coefficient of static friction.If the box continues to move with anacceleration of 1.69 m/s2. What is thecoefficient of kinetic friction?2. A box of 45ON is lying in an inclined planewith angle of 35 degrees. If the applied load tomove the box is 269N. Determine the net Ff andthe acceleration of the box if the coefficient ofstatic friction is 0.35 and the coefficient ofkinetic friction is 0.28.

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Answered: 1. A force of 69N is needed to start an…

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 7.73P: The normal pressure acting on the disk of the sander is given by p=(4/3)+(r2/6), where p is the...

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1. A force of 69N is needed to start an 6.9kg box moving across a horizontal surface. Calculate the coefficient of static friction. If the box continues to move with an acceleration of 1.69 m/s2. What is the coefficient of kinetic friction? 2. A box of 450N is lying in an inclined plane with angle of 35 degrees. If the applied load to move the box is 269N. Determine the net Ff and the acceleration of the box if the coefficient of static friction is 0.35 and the coefficient of kinetic friction is 0.28.
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 ?
A box weighing 150lb is moved across a horizontal Floor by dragging it by means of a rope attached to the front end. If the rope makes an angle of 30° with the floor and if the coefficient of friction between box and floor is 0.400, find the force exerted by the man pulling the rope.
The height of the g point is 0.5m, the distance of the rear wheel to theg point is 1.75m, the distance of the front wheel to the g point is 1.8 m, and the car with a mass of 2100kg brakes suddenly while moving at 24v speed. l-Find the friction coefficient between the wheel and the road? 2-Find the way the vehicle takes until it stops?
A 140-kg block is resting on a 25 deg inclined plane with a coefficient of friction = 0.83. Find the required horizontal force P (kN) that is necessary to start the block UP the incline ROUND OFF TO TWO DECIMAL PLACES.
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Q) The static friction coefficient between the box stationary on the inclined surface and the surface is gs. If you know the mass of the box is 25 kg, and 4, = 0.35, what force T is required to start the box -y 40T sliding up the surface? Then discuss your results Fig. Q.
The rope is once wrapped in stationary dram, as shown with weights. The rope is just on the point of slipping. What is the coefficient of friction?

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