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The two surfaces in contact having maximum coefficient of static friction are:

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Important Questions on Friction

EASY
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 2
A block of mass 2 kg is placed on a plane surface. The coefficient of static friction is 0.4. When a 2.8 N force is applied on the block parallel to the surface, the force of friction between the block and the surface is:
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11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 3
A block just begins to slide over a horizontal floor, when pulled by a force of 10 N. If we pull it by a force of  6 N, the force of friction that will come in to play is :
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11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 4
A block of mass 0.1 kg is held against a wall by applying a horizontal force of 5 N on the block. If the coefficient of friction between the block and the wall is 0.5, the magnitude of the frictional force acting on the block is:
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11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 5

A cubical block of mass m is held stationary against a rough wall by applying a horizontal force F, as shown. Which of the following statements is incorrect?

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11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 6
A rope lies on a table with a part hanging over the table’s edge. The rope starts sliding when the length of the hanging part is 20% of the total length. The coefficient of friction between the rope and the table is:
MEDIUM
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 7

In the figure, a ladder of mass m  is shown leaning against a wall. It is in static equilibrium making an angle θ with the horizontal floor. The coefficient of friction between the wall and the ladder is μ1 and that between the floor and the ladder is μ2. The normal reaction of the wall on the ladder is N1 and that of the floor is N2. If the ladder is about to slip, then:

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11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 8
A box has to be dragged on a rough level with constant velocity by applying force F  making an angle α with horizontal. The angle of friction is θ, in order that the required force be minimum, we should have:
 
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11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 9
An insect crawls up a hemispherical surface very slowly. The coefficient of friction between the insect and the surface is 1/3. If the line joining the centre of the hemispherical surface to the insect makes an angle α with the vertical, then the maximum possible value of α is given by :