FrictionHard
Question
A block A (5 kg) rests over another block B (3 kg) placed over a smooth horizontal surface. There is friction between A and B. A horizontal force F1 gradually increasing from zero to a maximum is applied to A so that the blocks move together without relative motion. Instead of this another horizontal force F2, gradually increasing from zero to a maximum is applied to B so that the blocks move together without relative motion. Then
Options
A.F1 (max) = F2 (max)
B.F1 (max) > F2 (max)
C.F1 (max) < F2 (max)
D.F1 (max) : F2 (max) = 5 : 3
Solution
(B,D) Case I
Since, no relative motion
Ff is friction between A and B
a =
⇒ F1(max) = 
Ff
Case = II
a =
⇒ F2(max) = 
Ff
Clearly ; F1 (max) > F2 (max)
and
Since, no relative motion
Ff is friction between A and B
a =
⇒ F1(max) = FfCase = II
a =
⇒ F2(max) = FfClearly ; F1 (max) > F2 (max)
and
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