A uniform metal chain is placed on a rough table such that one end of chain hangs down over edge of

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4-2.Friction

medium

A uniform metal chain is placed on a rough table such that one end of chain hangs down over the edge of the table. When one-third of its length hangs over the edge, the chain starts sliding. Then, the coefficient of static friction is

$\frac{3}{4}$

$\frac{1}{4}$

$\frac{2}{3}$

$\frac{1}{2}$

Solution

(d) ${\mu _s} = \frac{{{\rm{Lenght\, of \,the\, chain\, hanging \,from \,the \,table }}}}{{{\rm{Length \,of \,the \,chain\, lying \,on\, the \,table}}}}$

$ = \frac{{l/3}}{{l – l/3}} = \frac{{l/3}}{{2l/3}} = \frac{1}{2}$

Standard 11

Physics

A horizontal force of $10 \,N$ is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is $0.2$. the weight of the block is …….. $N$

easy

(AIEEE-2003)

Find the minimum value of $m$ that should placed on $20\, kg$, so that system remain at rest …….. $kg$

medium

A force $f$ is acting on a block of mass $m$. Coefficient of friction between block and surface is $\mu$. The block can be pulled along the surface if :-

normal

A block of mass $15 \;kg$ is placed on a long trolley. The coefficient of static friction between the block and the trolley is $0.18$. The trolley accelerates from rest with $0.5 \;m s ^{-2}$ for $20 \;s$ and then moves with uniform velocity. Discuss the motion of the block as vlewed by

$(a)$ a stationary observer on the ground,

$(b)$ an observer moving with the trolley.

medium

A force of $19.6\, N$ when applied parallel to the surface just moves a body of mass $10 \,kg$ kept on a horizontal surface. If a $5\, kg$ mass is kept on the first mass, the force applied parallel to the surface to just move the combined body is…….. $N.$

medium

A uniform metal chain is placed on a rough table such that one end of chain hangs down over the edge of the table. When one-third of its length hangs over the edge, the chain starts sliding. Then, the coefficient of static friction is

Solution

Similar Questions

A horizontal force of $10 \,N$ is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is $0.2$. the weight of the block is …….. $N$

Find the minimum value of $m$ that should placed on $20\, kg$, so that system remain at rest …….. $kg$

A force $f$ is acting on a block of mass $m$. Coefficient of friction between block and surface is $\mu$. The block can be pulled along the surface if :-

A force of $19.6\, N$ when applied parallel to the surface just moves a body of mass $10 \,kg$ kept on a horizontal surface. If a $5\, kg$ mass is kept on the first mass, the force applied parallel to the surface to just move the combined body is…….. $N.$

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