A lift is moving downwards with an acceleration equal to acceleration due to gravity. A body of mass

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4-2.Friction

easy

A lift is moving downwards with an acceleration equal to acceleration due to gravity. A body of mass $m$ kept on the floor of the lift is pulled horizontally. If the coefficient of friction is $\,\mu $, then the frictional resistance offered by the body is

A$mg$

B$\mu mg$

C$2\mu mg$

DZero

Solution

(d) $(N=\text { normal, } m=\text { mass of object, } a=$ acceleration of lift)
$m g-N=m a$
$N=m a-m g$
$(\text { given } a=g)$
therefore $N=0$
friction $=u . N$
hence friction $=u .0(\mathrm{N}=0)$
$=0$

Standard 11

Physics

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medium

A lift is moving downwards with an acceleration equal to acceleration due to gravity. A body of mass $m$ kept on the floor of the lift is pulled horizontally. If the coefficient of friction is $\,\mu $, then the frictional resistance offered by the body is

Solution

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