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Problems on normal reaction and coefficient of friction?
A uniform ladder AB, 5m long, weights 200N. It rests on a rough horizontal ground at A and against a smooth vertical wall at B. It is inclined at 30' to the vertical.
Find
(i) The normal reaction at A
(ii) The normal reaction at B
(iii) The coefficient of friction at A
1 Answer
- QuarkLv 610 years agoFavorite Answer
(i) The normal reaction at A :
NA = w = 200 N
(ii) The normal reaction at B :
Στ(A) = 0
----> NB * L * cos θ = W * 1/2L ) sin θ
NB = (1/2) * w * tan θ
= (1/2) * 200 * tan 30 = 57.74 N
(iii) f = NB
μ * NA = NB
μ * 200 = 57.74 ---> μ = 57.74/200 = 0.29
