If {μ ₛ},,{μ ₖ} and {μ ᵣ} are coefficients of static friction, sliding friction and rolling

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4-2.Friction

easy

If ${\mu _s},\,{\mu _k}$ and ${\mu _r}$ are coefficients of static friction, sliding friction and rolling friction, then

${\mu _s} < {\mu _k} < {\mu _r}$

${\mu _k} < {\mu _r} < {\mu _s}$

${\mu _r} < {\mu _k} < {\mu _s}$

${\mu _r} = {\mu _k} = {\mu _s}$

Solution

which implies that the rolling friction is least because of the wheel and rotating effect and the kinetic friction is in middle of the series because of its moving properties $\&$ static friction is highest because of the limiting moving properties.

Standard 11

Physics

A fireman of mass $60\, kg$ slides down a pole. He is pressing the pole with a force of $600 \,N$. The coefficient of friction between the hands and the pole is $0.5$, with what acceleration will the fireman slide down …….. $m/s^2$

medium

A small block of mass $m$ is projected horizontally with speed $u$ where friction coefficient between block and plane is given by $\mu = cx$, where $x$ is displacement of the block on plane. Find maximum distance covered by the block

hard

An insect is at the bottom of a hemispherical ditch of radius $1\, m$. It crawls up the ditch but starts slipping after it is at height $h$ from the bottom. If the coefficient of friction between the ground and the insect is $0.75,$ then $h$ is$…….m$
$\left(g=10\, m s^{-2}\right)$

hard

(JEE MAIN-2020)

A body of weight $64\, N$ is pushed with just enough force to start it moving across a horizontal floor and the same force continues to act afterwards. If the coefficients of static and dynamic friction are $0.6$ and $0.4$ respectively, the acceleration of the body will be (Acceleration due to gravity $= g$)

medium

$Assertion$ : On a rainy day it is difficult to drive a car or bus at high speed.
$Reason$ : The value of coefficient of friction is lowered due to wetting of the surface

easy

(AIIMS-1999)

If ${\mu _s},\,{\mu _k}$ and ${\mu _r}$ are coefficients of static friction, sliding friction and rolling friction, then

Solution

Similar Questions

A fireman of mass $60\, kg$ slides down a pole. He is pressing the pole with a force of $600 \,N$. The coefficient of friction between the hands and the pole is $0.5$, with what acceleration will the fireman slide down …….. $m/s^2$

A small block of mass $m$ is projected horizontally with speed $u$ where friction coefficient between block and plane is given by $\mu = cx$, where $x$ is displacement of the block on plane. Find maximum distance covered by the block

An insect is at the bottom of a hemispherical ditch of radius $1\, m$. It crawls up the ditch but starts slipping after it is at height $h$ from the bottom. If the coefficient of friction between the ground and the insect is $0.75,$ then $h$ is$…….m$ $\left(g=10\, m s^{-2}\right)$

$Assertion$ : On a rainy day it is difficult to drive a car or bus at high speed. $Reason$ : The value of coefficient of friction is lowered due to wetting of the surface

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An insect is at the bottom of a hemispherical ditch of radius $1\, m$. It crawls up the ditch but starts slipping after it is at height $h$ from the bottom. If the coefficient of friction between the ground and the insect is $0.75,$ then $h$ is$…….m$
$\left(g=10\, m s^{-2}\right)$

$Assertion$ : On a rainy day it is difficult to drive a car or bus at high speed.
$Reason$ : The value of coefficient of friction is lowered due to wetting of the surface