Engineering Mechanics - Friction - Discussion

Discussion :: Friction - General Questions (Q.No.5)

5. 

A 17-kg ladder has a center of mass at G. If the coefficients of friction at A and B are A = 0.3 and B = 0.2, respectively, determine the smallest horizontal force that the man must exert of the ladder at point C in order to push the ladder forward.

[A]. F = 120.2 N
[B]. F = 288 N
[C]. F = 166.8 N
[D]. F = 204 N

Answer: Option D

Explanation:

No answer description available for this question.

Rathish Kumar Singh. said: (Feb 11, 2012)  
Apply the frictional forces at points A and B, the normal reactions at A and B. Write the conditions of equilibirium.

But take the moments about the centre of gravity of ladder, you will get afterwards the required force P.

Rajni Mallick said: (Oct 8, 2014)  
My Question 1. A block of mass m rests in a V- shaped channel as shown in fig (a) & (b) determine what horizontal force P must be applied for the motion to impend.

Arunkumar said: (Mar 13, 2015)  
Shall any one explain in detail?

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