A force of 19.6, N when applied parallel to surface just moves a body of mass 10 ,kg kept on a horiz

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4-2.Friction

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........ $N.$

$29.4$

$39.2$

$18.6$

$42.6$

Solution

(a) ${F_l} \propto R$ $\therefore $ ${F_l} \propto m$ i.e. limiting friction depends upon the mass of body. So, $\frac{{({F_l})\,\prime }}{{({F_l})}} = \frac{{m'}}{m} = \frac{{10 + 5}}{{10}}$

==>$({F_l})\,\prime = \frac{3}{2} \times {F_l} = \frac{3}{2} \times 19.6 = 29.4\;N$

Standard 11

Physics

Two masses $m_1 = 5\ kg$ and $m_2 = 10\ kg$, connected by an inextensible string over a frictionless pulley, are moving as shown in the figure. The coefficient of friction of horizontal surface is $0.15$. The minimum weight $m$ that should be put on top of $m_2$ to stop the motion is …….. $kg$

hard

(JEE MAIN-2018)

If a ladder weighing $250\,N$ is placed against a smooth vertical wall having coefficient of friction between it and floor is $0.3$, then what is the maximum force of friction available at the point of contact between the ladder and the floor …….. $N$

easy

(AIIMS-2002)

A body of mass $4\, kg$ is at rest on a horizontal table. The coefficient of friction between the body and the table is $0.2$ . A horizontal force of $6N$ is applied on the body. The acceleration of the body is ………. $m/s^2$

medium

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

easy

The blocks $A$ and $B$ are arranged as shown in the figure. The pulley is frictionless. The mass of $A$ is $10 \,kg$. The coefficient of friction of $A$ with the horizontal surface is $0.20$. The minimum mass of $B $ to start the motion will be…… $kg$

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........ $N.$

Solution

Similar Questions

Two masses $m_1 = 5\ kg$ and $m_2 = 10\ kg$, connected by an inextensible string over a frictionless pulley, are moving as shown in the figure. The coefficient of friction of horizontal surface is $0.15$. The minimum weight $m$ that should be put on top of $m_2$ to stop the motion is …….. $kg$

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