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A block of mass 15 kg is resting on a rough inclined plane as shown in the figure. The block is tied by a horizontal string which has a tension of 50 N. The coefficient of friction between the surfaces of contact is

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Important Questions on Newton's Laws of Motion (With Friction)

MEDIUM
JEE Advanced
IMPORTANT
PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 7 - Newton's Laws of Motion (With Friction)>Exercises>Q 10
A horizontal force just sufficient to move a body of mass 4 kg lying on a rough horizontal surface is applied to it. The coefficient of static and kinetic friction between the body and the surface are 0.8 and 0.6, respectively. If the force continues to act even after the block has started moving, the acceleration of the block in m s-2 is (g=10 m s-2)
HARD
JEE Advanced
IMPORTANT
PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 7 - Newton's Laws of Motion (With Friction)>Exercises>Q 11
A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given. The upper half of an inclined plane with inclination ϕ is perfectly smooth while the lower half is rough.
HARD
JEE Advanced
IMPORTANT
PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 7 - Newton's Laws of Motion (With Friction)>Exercises>Q 12
A body of mass m is launched upon a rough inclined plane making an angle 45° with horizontal. If the time of ascent is half of the time of descent, the frictional coefficient between plane and body is
HARD
JEE Advanced
IMPORTANT
PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 7 - Newton's Laws of Motion (With Friction)>Exercises>Q 13
A wooden block of mass M resting on a rough horizontal floor is pulled with a force F at an angle ϕ with the horizontal. If μ. is the coefficient of kinetic friction between the block and the surface, then the acceleration of the block is
 
HARD
JEE Advanced
IMPORTANT
PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 7 - Newton's Laws of Motion (With Friction)>Exercises>Q 14
Find the coefficient of kinetic friction between the object and the incline, when a object takes n times more time to slide down 45° rough inclined plane as it takes to slide down a perfectly smooth 45° incline.
HARD
JEE Advanced
IMPORTANT
PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 7 - Newton's Laws of Motion (With Friction)>Exercises>Q 15

Two blocks of masses 0.2 kg and 0.5 kg, which are placed 22 m apart on a rough horizontal surface (μ=0.5), are acted upon by two forces of magnitude 3 N each as shown in figure at time t=0. Then, the time t at which they collide with each other is 

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EASY
JEE Advanced
IMPORTANT
PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 7 - Newton's Laws of Motion (With Friction)>Exercises>Q 16
A block of mass M is being pulled along rough horizontal surface. The coefficient of friction between the block and the surface is μ another block of mass M2  is placed on the block and it is again pulled on the surface, the coefficient of friction between the block and the surface will be
HARD
JEE Advanced
IMPORTANT
PHYSICS For Joint Entrance Examination JEE (Advanced) Mechanics I>Chapter 7 - Newton's Laws of Motion (With Friction)>Exercises>Q 17
A body of mass M is resting on a rough horizontal plane surface, the coefficient of friction being equal to  μ. At  t=0, a horizontal force  F=F0t  starts acting on it, where  F0 is a constant. Find the time  t at which the motion starts?