Physics-
General
Easy
Question
STATEMENT-1 : A block of mass m is placed at rest on rough horizontal surface. The coefficient of friction between the block and horizontal surface is 
. The minimum force F applied at angle 
(as shown in figure) to pull the block horizontally is not equal to mmg. (Take 
)
STATEMENT-2 : For a block of mass m placed on rough horizontal surface, the minimum horizontal force required to pull the block is 
. The minimum force F applied at angle 
(as shown in figure) to pull the block horizontally may be less than mmg. (Where 
is co-efficient of friction)
- Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.
- Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
- Statement-1 is True, Statement-2 is False
- Statement-1 is False, Statement-2 is True
The correct answer is: Statement-1 is False, Statement-2 is True
Related Questions to study
physics-
In the following figure, find the direction of friction on the blocks and ground respectively
In the following figure, find the direction of friction on the blocks and ground respectively
physics-General
physics-
A mass m is supported as shown in the figure by ideal strings connected to a rigid wall and to a mass 3m at rest on a fixed horizontal surface. The string connected to larger mass is horizontal, that connected to smaller mass is vertical and the one connected to wall makes an angle 
with horizontal. Then the minimum coefficient of static friction between the larger mass and the horizontal surface that permits the system to remain in equilibrium in the situation shown is:
A mass m is supported as shown in the figure by ideal strings connected to a rigid wall and to a mass 3m at rest on a fixed horizontal surface. The string connected to larger mass is horizontal, that connected to smaller mass is vertical and the one connected to wall makes an angle with horizontal. Then the minimum coefficient of static friction between the larger mass and the horizontal surface that permits the system to remain in equilibrium in the situation shown is:
physics-General
physics-
Given 
. Between A and B 
, between B and C 
and between C and ground 
. The least horizontal force F to start the motion of any part of the system of three blocks resting upon one another as shown in figure is (g = 10 
)
Given . Between A and B , between B and C and between C and ground . The least horizontal force F to start the motion of any part of the system of three blocks resting upon one another as shown in figure is (g = 10 )
physics-General
physics-
In the system shown in figure the friction coefficient between ground and bigger block is . There is no friction between both the blocks. The string connecting both the block is light; all three pulleys are light and frictionless. Then the minimum limiting value of so that the system remains in equilibrium is
In the system shown in figure the friction coefficient between ground and bigger block is . There is no friction between both the blocks. The string connecting both the block is light; all three pulleys are light and frictionless. Then the minimum limiting value of so that the system remains in equilibrium is
physics-General
physics-
A chain of length L is placed on a horizontal surface as shown in figure. At any instant x is the length of chain on rough surface and the remaining portion lies on smooth surface. Initially x = 0. A horizontal force P is applied to the chain (as shown in the figure ). In the duration x changes from x = 0 to x = L, for chain to move with constant speed:
A chain of length L is placed on a horizontal surface as shown in figure. At any instant x is the length of chain on rough surface and the remaining portion lies on smooth surface. Initially x = 0. A horizontal force P is applied to the chain (as shown in the figure ). In the duration x changes from x = 0 to x = L, for chain to move with constant speed:
physics-General
chemistry-
What are types of following semiconductors I and II
What are types of following semiconductors I and II
chemistry-General
chemistry-
What type of crystal defect is indicated in the diagram given below
What type of crystal defect is indicated in the diagram given below
chemistry-General
physics-
A force F = t is applied to a block A as shown in figure, where t is time in seconds. The force is applied at t = 0 seconds when the system was at rest. Which of the following graph correctly gives the frictional force between A and horizontal surface as a function of time t.[Assume that at t = 0, tension in the string connecting the two blocks is zero]
A force F = t is applied to a block A as shown in figure, where t is time in seconds. The force is applied at t = 0 seconds when the system was at rest. Which of the following graph correctly gives the frictional force between A and horizontal surface as a function of time t.[Assume that at t = 0, tension in the string connecting the two blocks is zero]
physics-General
physics-
The two blocks, m = 10 kg and M = 50 kg are free to move as shown. The coefficient of static friction between the blocks is 0.5 and there is no friction between M and the ground. A minimum horizontal force F is applied to hold m against M that is equal to :
The two blocks, m = 10 kg and M = 50 kg are free to move as shown. The coefficient of static friction between the blocks is 0.5 and there is no friction between M and the ground. A minimum horizontal force F is applied to hold m against M that is equal to :
physics-General
physics-
The coefficient of friction between 4kg and 5 kg blocks is 0.2 and between 5 kg block and ground is 0.1 respectively. Choose the correct statement:
The coefficient of friction between 4kg and 5 kg blocks is 0.2 and between 5 kg block and ground is 0.1 respectively. Choose the correct statement:
physics-General
physics-
In the shown arrangement if f1 , f2 and T be the frictional forces on 2 kg block, 3kg block & tension in the string respectively, then their values are:
In the shown arrangement if f1 , f2 and T be the frictional forces on 2 kg block, 3kg block & tension in the string respectively, then their values are:
physics-General
physics-
A bead of mass m is located on a parabolic wire with its axis vertical and vertex directed towards downward as in figure and whose equation is 
. If the coefficient of friction is , the highest distance above the x-axis at which the particle will be in equilibrium is
A bead of mass m is located on a parabolic wire with its axis vertical and vertex directed towards downward as in figure and whose equation is . If the coefficient of friction is , the highest distance above the x-axis at which the particle will be in equilibrium is
physics-General
physics-
Two block of masses 
and 
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 .
Two block of masses and 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 .
physics-General
physics-
In the arrangement shown in the figure mass of the block B and A are 2m,, 8m respectively. Surface between B and floor is smooth. The block B is connected to block C by means of a pulley. If the whole system is released then the minimum value of mass of the block C so that the block A remains stationary with respect to B is : (Co-efficient of friction between A and B is m.)
In the arrangement shown in the figure mass of the block B and A are 2m,, 8m respectively. Surface between B and floor is smooth. The block B is connected to block C by means of a pulley. If the whole system is released then the minimum value of mass of the block C so that the block A remains stationary with respect to B is : (Co-efficient of friction between A and B is m.)
physics-General
maths-
For 
lies in the interval
For lies in the interval
maths-General
