In figure shown, a block of weight 10 ,N resting on a horizontal surface. coefficient of static fric

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4-2.Friction

easy

In the figure shown, a block of weight $10 \,N$ resting on a horizontal surface. The coefficient of static friction between the block and the surface ${\mu _s} = 0.4$. A force of $3.5\, N$ will keep the block in uniform motion, once it has been set in motion. A horizontal force of $3 \,N$ is applied to the block, then the block will

AMove over the surface with constant velocity

BMove having accelerated motion over the surface

CNot move

DFirst it will move with a constant velocity for some time and then will have accelerated motion

Solution

(c)${F_l} = {\mu _s}R = 0.4 \times mg\, = 0.4 \times 10 = 4N$i.e. minimum $4\,N$ force is required to start the motion of a body. But applied force is only $3\,N$. So the block will not move.

Standard 11

Physics

For the given figure find acceleration of $40\, kg$ block …….. $m/s^2$

medium

A body of mass M is kept on a rough horizontal surface (friction coefficient $\mu $). A person is trying to pull the body by applying a horizontal force but the body is not moving. The force by the surface on the body is $F$, where

medium

A block of mass $m$ is pressed against a vertical surface by a spring of unstretched length $l$ . If the coefficient of friction between the block and the surface is $\mu $. Choose the correct statement.

hard

A body of mass $1\, kg$ rests on a horizontal floor with which it has a coefficient of static friction $\frac{1}{\sqrt{3}}$. It is desired to make the body move by applying the minimum possible force $F\, N$. The value of $F$ will be the Nearest Integer) [Take $g =10 \,ms ^{-2}$ ]

hard

(JEE MAIN-2021)

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 $, if the lift is moving upwards with a uniform velocity, then the frictional resistance offered by the body is