Two blocks of masses m₁ and m₂ are connected with a massless unstretched spring and placed over

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4-2.Friction

hard

Two blocks of masses $m_1$ and $m_2$ are connected with a massless unstretched spring and placed over a plank moving with an acceleration ' $a$ ' as shown in figure. the coefficient of friction between the blocks and platform is $\mu$.

Aspring will be stretched if $a > \mu g$

Bspring will be in its natural length under all conditions.

Cspring will neither be compressed nor be stretched for $a \leq \mu g$

Dspring will be compressed if $a \leq \mu g$

Solution

$\therefore f _{ r }$ static and $f _{ r }$ kinetic
both provide same acceleration
to $m_1$ and $m_2$.
So no relative motion between them
$\therefore x=0$ (Always)

Standard 11

Physics

In figure, the coefficient of friction between the floor and the block $B$ is $0.2$ and between blocks $A$ and $B$ is $0.3$. …….. $N$ is the maximum horizontal force $F$ can be applied to the block $B$ so that both blocks move together .

hard

Two blocks $A$ and $B$ of masses $m_A = 1\,kg$ and $m_B = 3\,kg$ are kept on the table as shown in figure. The coefficient of friction between $A$ and $B$ is $0.2$ and between $B$ and the surface of the table is also $0.2.$ The maximum force $F$ that can be applied on $B$ horizontal, so that the block $A$ does not slide over the block $B$ is …….. $N$. [Take $g = 10\,m/s^2$ ]

hard

(JEE MAIN-2019)

A block A with mass $100\, kg $ is resting on another block $B$ of mass $200\, kg$. As shown in figure a horizontal rope tied to a wall holds it. The coefficient of friction between $A$ and $B$ is $ 0.2 $ while coefficient of friction between $B$ and the ground is $0.3$. The minimum required force $F$ to start moving $B$ will be …….. $N$

medium

If the coefficient of friction between block & wedge is $\mu $, then the maximum horizontal acceleration of the wedge for which block will remain at rest w.r.t. the wedge is

hard

In the given arrangement the maximum value of $F$ for which there is no relative motion between the blocks

medium

Two blocks of masses $m_1$ and $m_2$ are connected with a massless unstretched spring and placed over a plank moving with an acceleration ' $a$ ' as shown in figure. the coefficient of friction between the blocks and platform is $\mu$.

Solution

Similar Questions

In figure, the coefficient of friction between the floor and the block $B$ is $0.2$ and between blocks $A$ and $B$ is $0.3$. …….. $N$ is the maximum horizontal force $F$ can be applied to the block $B$ so that both blocks move together .

If the coefficient of friction between block & wedge is $\mu $, then the maximum horizontal acceleration of the wedge for which block will remain at rest w.r.t. the wedge is

In the given arrangement the maximum value of $F$ for which there is no relative motion between the blocks

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