A block of mass $$m$$ is placed on a flat horizontal surface, and the coefficient of friction between the block and the surface is $$\mu$$. A force $$F_A$$ is applied to the block from above, and a force $$F_R$$ is applied to the right. In all situations being considered below, the block remains at rest. Let $$f$$ be the force of friction on the block.

Consider the statements:
(P) $$f$$ increases if $$m$$ is increased.
(Q) $$f$$ increases if $$F_A$$ is increased.
(R) $$f$$ increases if $$F_R$$ is increased.

1.  Only P is true.
2.  Only Q is true.
3.  P, Q are true.
4.  Only R is true.
Subtopic:  Friction |
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Mark the correct statements about the friction between two bodies.
(a) static friction is always greater than kinetic friction.
(b) coefficient of static friction is always greater than the coefficient of kinetic friction.
(c) limiting friction is always greater than kinetic friction.
(d) limiting friction is never less than static friction.
Choose the correct option:
1. (a), (b) and (c)
2. (b), (c) and (d)
3. (a) and (d)
4. (c) and (d)

Subtopic:  Friction |
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In the figure, the coefficient of friction between the floor and body B is 0.1. The coefficient of friction between bodies B and A is 0.2. A force F is applied as shown on B. The mass of A is rn/2 and of B is m.

(a) The bodies will move together if F = O .25 mg
(b) The A will slip with B if F = 0.5 mg
(c) The bodies will move together if F = 0.5 mg
(d) The bodies will be at rest if F = 0.1 mg
(e) The maximum value of F for which the two bodies will move together is 0.45 mg

Which of the following statement(s) is/are true?

1. (a, b, d, e)

2. (a, c, d, e)

3. (b, c, d)

4. (a, b, c)

Subtopic:  Application of Laws | Friction |
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Assertion: Angle of repose is equal to the angle of limiting friction.
Reason: When a body is just at the point of motion, the force of friction at this stage is called limiting friction.
1. Both assertion and reason are correct and the reason is the correct explanation of Assertion.
2. Both assertion and reason are correct but the reason is not the correct explanation of assertion.
3. Assertion is correct and the reason is incorrect.
4. Assertion is incorrect and the reason is correct.
Subtopic:  Friction |
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Assertion: The acceleration of a body down a rough inclined plane is greater than the acceleration due to gravity.
Reason: The body is able to slide on an inclined plane only when its acceleration is greater than the acceleration due to gravity.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both assertion and reason are false.

Subtopic:  Friction |
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Assertion: It is easier to pull a heavy object than to push it on a levelled ground.
Reason: The magnitude of the frictional force depends on the nature of the two surfaces in contact.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both assertion and reason are false.

Subtopic:  Friction |
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Assertion: The use of ball bearings between two moving parts of a machine is a common practice.
Reason: Ball bearings reduce vibrations and provide good stability.

1. Both assertion & reason are true and the reason is the correct explanation of the assertion
2. Both assertion & reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but the reason is false.
4. Both assertion and reason are false statements.

Subtopic:  Friction |
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Assertion: It is difficult to move a bicycle along a road with its brakes on.
Reason: When a bicycle moves with its brakes on, it skids and sliding friction is greater than rolling friction.

1. Both assertion & reason are true and the reason is the correct explanation of the assertion
2. Both assertion & reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but the reason is false.
4. Both assertion and reason are false statements.
Subtopic:  Friction |
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