Find the coefficient of friction between ladder and floor, Mechanical Engineering

Find the coefficient of friction between ladder and floor:

A ladder of 5m long rests on horizontal ground and leans against smooth vertical wall at an angle of 70° with the horizontal. The weight of ladder is 900N and acts at middle. The ladder is at point of sliding, when the man weighing 750N stands 1.5m from the bottom of ladder. Calculate the coefficient of friction between ladder and floor.

Sol.: Forces acting on ladder is shown in the figure

By resolving all the forces vertically,

 

1417_Find the coefficient of friction between ladder and floor.png

RV = R - 900 - 750 = 0

R = 1650N                                                   ...(i)

Taking moment about the point B,

R × 5sin20° - Fr  × 5cos20° - 900 × 2.5sin20° - 750 × 3.5sin20° = 0

As Fr = µR, and R = 1650N; Fr  = 1650µ

Putting, value of R and Fr

µ = 0.127              .......ANS

Posted Date: 10/18/2012 2:39:03 AM | Location : United States







Related Discussions:- Find the coefficient of friction between ladder and floor, Assignment Help, Ask Question on Find the coefficient of friction between ladder and floor, Get Answer, Expert's Help, Find the coefficient of friction between ladder and floor Discussions

Write discussion on Find the coefficient of friction between ladder and floor
Your posts are moderated
Related Questions


The specifications for use on a project will be as defined in the Project Execution plan. The Specification requirements will be clarified in the Engineering Estimate or at the Pr

Requirements for Standard Interface  The interface must be capable of handling all kinds of manufacturing data. There should be no information loss when data is transf

Scheduling and Sequencing: This unit begin with the basic concept and the role of scheduling in industry. Several job- sequencing rules to address the manufacturing process ar


Q. Illustrate Clay content test? Under this test, the clay content is measured by washing it off the sand sample. The standard dried sand sample (50 gm) is put in a mixing devi

Parallelogram law of forces: The law of parallelogram is used to determine the resultant of two forces acting at the point of a rigid body in plane and is inclined to each o

(a) Draw a single point cutting tool and label clearly the several parts of it. Illustrate them in brief. (b) What are the several factors affecting tool life ? (c) List char

Figure : Front Top View of the Motorcycle Part No. Part Name Functions 1 Turn signal switch Used to give