List of top Physics Questions on Friction

There are two inclined surfaces of equal length inclined at an angle of \(45^\circ\) with the horizontal. One of them is rough and the other is perfectly smooth. A given body takes 2 times as much time to slide down on the rough surface than on the smooth surface. The coefficient of kinetic friction (\(\mu_k\)) between the object and the rough surface is close to :
A block of mass 5 kg is placed on a frictionless surface and pushed with a force of 20 N at an angle of 30° to the horizontal. What is the acceleration of the block?
Choose the correct statement
A block of mass \( 5 \, \text{kg} \) is placed on a horizontal surface. The coefficient of friction between the block and the surface is \( 0.4 \). What is the force of friction acting on the block?
If a stone of mass \( 0.5~\text{kg} \) tied to one end of a wire is whirled in a circular path of radius \( 2~\text{m} \) with a speed \( 40~\text{rev/min} \) in a horizontal plane, then the tension in the wire is nearly
A body is projected vertically upwards with a velocity of \( 20~\text{ms}^{-1} \). If the potential energy of the body at a height of \( 5~\text{m} \) from the ground is \( 100~\text{J} \), then the kinetic energy of the body at a height of \( 10~\text{m} \) from the ground is
\textit{(Acceleration due to gravity \( g = 10~\text{ms}^{-2} \))}
If a body of mass \(2 \, \text{kg}\) moving with initial velocity of \(4 \, \text{m/s}\) is subjected to a force of \(3 \, \text{N}\) for a time of 2 seconds normal to the direction of its initial velocity, then the resultant velocity of the body is:
A body of mass \(m\) moving along a straight line collides with a stationary body of mass \(2m\). After collision if the two bodies move together with the same velocity, then the fraction of kinetic energy lost in the process is:
If a particle is moving along a circle of radius \( r \) with constant speed \( v \), then the magnitude of the change in velocity when the particle moves from \( P \) to \( Q \), where \( PQ \) makes an angle \( \theta \) at the center of the circle is:
If the tension in the horizontal wire shown in the figure is 30 N, then the weight \( W \) and tension in the wire \( OA \) are respectively:
tension in the horizontal wire
A balloon with mass 'm' is descending vertically with an acceleration 'a' (where a \(<\) g). The mass to be removed from the balloon, so that it starts moving vertically up with an acceleration 'a' is
A conveyor belt is moving horizontally with a velocity of \( 2 \, \text{m s}^{-1} \). If a body of mass 10 kg is kept on it, then the distance travelled by the body before coming to rest is (The coefficient of kinetic friction between the belt and the body is 0.2 and acceleration due to gravity is \( 10 \, \text{m s}^{-2} \))
If the tension in the horizontal wire shown in the figure is 30 N, then the weight \( W \) and tension in the wire \( OA \) are respectively:
tension in the horizontal wire
If a particle is moving along a circle of radius \( r \) with constant speed \( v \), then the magnitude of the change in velocity when the particle moves from \( P \) to \( Q \), where \( PQ \) makes an angle \( \theta \) at the center of the circle is:
A balloon with mass 'm' is descending vertically with an acceleration 'a' (where a \(<\) g). The mass to be removed from the balloon, so that it starts moving vertically up with an acceleration 'a' is
A conveyor belt is moving horizontally with a velocity of \( 2 \, \text{m s}^{-1} \). If a body of mass 10 kg is kept on it, then the distance travelled by the body before coming to rest is (The coefficient of kinetic friction between the belt and the body is 0.2 and acceleration due to gravity is \( 10 \, \text{m s}^{-2} \))
A block of mass $10~\text{kg}$ moving with a speed of $5~\text{m/s}$ on a frictionless horizontal surface suddenly explodes into two pieces.
If one piece with mass $4~\text{kg}$ moves with a speed of $10~\text{m/s}$, then the velocity of the second piece is
A body of mass $5~\text{kg}$ starts from the origin with an initial velocity $\vec{v}_0 = (30\hat{i} + 40\hat{j})~\text{m/s}$.
If a constant force $\vec{F} = -(i + 5j)~\text{N}$ acts on the body, then the time in which the y-component of its velocity becomes zero is
The power required for an engine to maintain a constant speed of 50 m s$^{-1}$ for a train of mass 3 $\times$ 10$^5$ kg on rough rails is (the coefficient of kinetic friction between the rails and wheels of the train is 0.05 and acceleration due to gravity = 10 m s$^{-2}$)
Identify the correct option from the following:
As shown in the figure, a force $F$ is applied on a block of mass $\frac{\sqrt{3}}{2}$ kg placed on a rough horizontal surface. The maximum value of $F$ for the block not to move is (coefficient of static friction between the block and the surface is $\frac{1}{2\sqrt{3}}$ and acceleration due to gravity = 10 m s$^{-2}$)
a force F is applied on a block of mass
Identify the correct option from the following:
A block of mass 2 kg is placed on a rough inclined plane at 30° to the horizontal. The coefficient of static friction is 0.4. Will the block slide down?
Coefficient of friction is the ratio of?
If $ \mu_s $ and $ \mu_k $ are static and kinetic friction, then:
The minimum force required to start pushing a body up a rough (having coefficient of friction \( \mu \)) inclined plane is \( F_1 \), while the minimum force needed to prevent it from sliding is \( F_2 \). If the inclined plane makes an angle \( \theta \) with the horizontal such that \( \tan\theta = 2\mu \), then the ratio \( \frac{F_1}{F_2} \) is:
A cubic block of mass $ m $ is sliding down on an inclined plane at $ 60^\circ $ with an acceleration of $ \frac{g}{2} $, the value of coefficient of kinetic friction is: