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A ladder AB is spported by a smooth vert...


A ladder AB is spported by a smooth vertical wall ad rough horizontal floor as shown. A boy tarts moving from A to B slowly. The ladder remains at rest, then pick up the correct statements (s):

A

Magnitude of normal reaction by the wall on ladder at point B will increase

B

Magnitude of normal reaction by the wall on ladder at point B will decrease

C

Magnitude of normal reaction by the floor on the ladder at point A will remain unchanged

D

Magnitude of friction force by the floor on the ladder at point A will increase

Text Solution

Verified by Experts

The correct Answer is:
A, C, D
Conider the situation when the boy is at horizontal distance of x frm A (m: mass of boy and M: mass of the ladder)
About, A `tau_(pet)=0 rArr mgx + mg a/2 = N_(B)b`
As x is increasing so is `N_(s)`
`N_(A) = Mg + mg`. i.e. `N_(A)` remains constant and `f=N_(s)` i.e., f is also increasing
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