Class 11PhysicsNewton's Laws of Motion and FrictionMix Examples-Newton's Laws of Motion and Friction
Difficult$A$ block $A$ of mass $m_1$ rests on a horizontal table. $A$ light string connected to it passes over a frictionless pulley at the edge of the table,and from its other end,another block $B$ of mass $m_2$ is suspended. The coefficient of kinetic friction between the block $A$ and the table is $\mu_k$. When the block $A$ is sliding on the table,the tension in the string is:
- A$\frac{m_1 m_2 (1 + \mu_k) g}{m_1 + m_2}$
- B$\frac{m_1 m_2 (1 - \mu_k) g}{m_1 + m_2}$
- C$\frac{(m_2 + \mu_k m_1) g}{m_1 + m_2}$
- D$\frac{(m_2 - \mu_k m_1) g}{m_1 + m_2}$
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Similar Questions
Match Column-$I$ with Column-$II$ correctly.
Column-$I$ Column-$II$ $(1)$ Static friction $(a)$ Limiting friction $(2)$ Rolling friction $(b)$ Ball bearing $(c)$ Object moving on a road
| Column-$I$ | Column-$II$ |
|---|---|
| $(1)$ Static friction | $(a)$ Limiting friction |
| $(2)$ Rolling friction | $(b)$ Ball bearing |
| $(c)$ Object moving on a road |
Easy
View Solution$A$ man can move on a horizontal plank supported symmetrically as shown. The variation of normal reaction on support $A$ with distance $x$ of the man from the end of the plank is best represented by:
Difficult
View Solution$A$ block $B$,lying on a table,has weight $w$. The coefficient of static friction between the block and the table is $\mu$. Assume that the cord between $B$ and the knot is horizontal. The maximum weight of the block $A$ for which the system will be stationary is
Give the magnitude and direction of the net force acting on a stone of mass $0.1\; kg$,
$(a)$ just after it is dropped from the window of a stationary train,
$(b)$ just after it is dropped from the window of a train running at a constant velocity of $36\; km/h$,
$(c)$ just after it is dropped from the window of a train accelerating with $1\; m/s^2$,
$(d)$ lying on the floor of a train which is accelerating with $1\; m/s^2$,the stone being at rest relative to the train.
Neglect air resistance throughout.
$(a)$ just after it is dropped from the window of a stationary train,
$(b)$ just after it is dropped from the window of a train running at a constant velocity of $36\; km/h$,
$(c)$ just after it is dropped from the window of a train accelerating with $1\; m/s^2$,
$(d)$ lying on the floor of a train which is accelerating with $1\; m/s^2$,the stone being at rest relative to the train.
Neglect air resistance throughout.
Medium
View Solution$Assertion$: On a rainy day,it is difficult to drive a car or bus at high speed.
$Reason$: The value of the coefficient of friction is lowered due to the wetting of the surface.
$Reason$: The value of the coefficient of friction is lowered due to the wetting of the surface.
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