Mechanical Engineering - Engineering Mechanics - Discussion

5. 

A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act

[A]. downward at its upper end
[B]. upward at its upper end
[C]. zero at its upper end
[D]. perpendicular to the wall at its upper end

Answer: Option C

Explanation:

No answer description available for this question.

Lucky said: (Jun 17, 2013)  
Friction will be always at slipping point of ladder means a horizontal surface. At wall there will be reaction Force Not Friction so.

Haseen said: (May 22, 2014)  
Wall is smooth given in the question so no friction.

Lalit Swami said: (May 8, 2015)  
Because the wall is smooth.

Sumi said: (Jul 3, 2018)  
I think the correct answer is B.

Uttu Don said: (Oct 2, 2018)  
Option B is correct.

Ashish said: (Dec 23, 2018)  
There is no normal reaction at an upper end.

Omid said: (Dec 7, 2019)  
Why B is correct. The upper end is smooth so no friction. The given answer is right.

Mamdud said: (Apr 7, 2020)  
Friction can be less but not zero.

Ravindra Vishwakarma said: (Aug 7, 2020)  
If any ladder is inclined against roughwall then friction act in both upward of vertical wall as well as towards it.

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