part B and C urgnt Q4(a) Explain laws of static friction.(b) A block weighing 2000 N is on a rough inclined plane that makes anangle of 15° with horizontal. Perform the following:(1) Draw the free body diagram of the block with all the requireddetails.(c)(ii) Determine coefficient of friction between the block and the planeif the force required to start motion upwards along the plane is800 N.Analyse the effect on force required to start motion if the weight of theblock is increased for the system given Question Q 4(b).

(b) A block weighing 2000 N is on a rough inclined plane that makes angle of 15° with horizontal. Perform the following: (1) Draw the free body diagram of the block with all the requir- details. (c) (ii) Determine coefficient of friction between the block and the plan if the force required to start motion upwards along the plane 800 N. Analyse the effect on force required to start motion if the weight of th blogl

(b) A block weighing 2000 N is on a rough inclined plane that makes angle of 15° with horizontal. Perform the following: (1) Draw the free body diagram of the block with all the requir- details. (c) (ii) Determine coefficient of friction between the block and the plan if the force required to start motion upwards along the plane 800 N. Analyse the effect on force required to start motion if the weight of th blogl

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 7.57P: The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a...

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The coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find the smallest angle and the corresponding force P that would initiate simultaneous tipping and sliding of the bar.
The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a mean radius of 75 mm. The static and kinetic coefficients of friction between the gear and the screw are 0.12 and 0.06, respectively. The input torque applied to the screw is C0=10Nm. Assuming constant speed operation, determine the output torque C1 acting on the gear.
A pile-driver hammer has a mass of 300 kg and is to be raised 16 m in 4 sec. The total friction on the guides is constant at 400 N. What constant pull must be exerted on the cable?
A homogeneous ladder 20m long weighing 50 N is leaning against a wall makes an angle of 15 degrees with the wall. Assuming that the coefficient of friction at all contact surfaces is 0.20. What horizontal force (F) acting on the lower third point of the ladder will cause it to slip outward?
(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?
A 20 kg block is held in place on an incline plane as shown by a rope that passesover a frictionless pulley at B and then over a fixed cylinder at C where thecoefficient between the rope and the fixed cylinder is 0.2. Given an angle ofincline, A = 25°, if a force of P = 200 V is applied to the end of the rope,(a) Will the block move if the coefficient of static friction between the block and theinclined surface is M, = 0.56?(b)If impending motion exists, will the block tip or slip?
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The ladder in the figure rests on a horizontal surface (point A) and a vertical wall (point B). The coefficient of static friction between the ladder and the horizontal surface is ??, while the friction of the ladder with the vertical wall is negligible. Assuming that the center of gravity of the ladder is at half its length, determine the minimum value of ??, to ensure that the ladder remains at rest.
Figure shows a 100 kg concrete cylinder resting on a wall at A. A 10° wedge is used at the bottom to prevent the concrete cylinder from rolling. The coefficients of static friction at A and B are 0.6 and 0.2, and the coefficient of static friction between the wedge and the floor is 0.3. By assuming the negligible weight of the wedge, determine the force P required to lift the concrete cylinder in the direction shown.
Q3/ A screw-jack is used to lft a load of 4 kN. The screw of the screw-jack is square threaded with two threads to 1 cm. If the co-efficient of friction between the nut and screw is 0,095 and outer diameter of screw s 6 cm, find the force required atthe end of the handle of length 50 cm to ift the load. (20 M)
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A uniform ladder is L=5.0m long and weighs 400.0 N. The ladder rests against a slippery vertical wall, as shown. The inclination angle between the ladder and the rough floor is β=53°.Find the normal forces from the floor and from the wall on the ladder and the coefficient of static friction μs at theinterface of the ladder with the floor thatprevents the ladder from slipping