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PhysicsNLMMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

Two blocks $A$ and $B$ are placed one over the other on a smooth horizontal surface. The maximum horizontal force that can be applied on the lower block $A,$ so that $A$ and $B$ move without separation is $49 N$ . The coefficient of friction between $A$ and $B$ is ( take $g = 9.8 m s^{- 2}$ )

Options:

Answer:

Solution:

Given, $F = 49 N$ , $M_{A} = 7 k g$ , $M_{B} = 3 k g$ , $μ = ?$

$F = (3 + 7) a$

$\Rightarrow a = 4 .9 m s^{- 2}$

Free body diagram of $B$

$f_{\max} = μ (3 g) = 3 a$

$μ = \frac{3 a}{3 g} = \frac{4 .9}{g} = \frac{4 .9}{9 .8} = 0 .5$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:NLMSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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