Statement I: Work done by friction is always negative.

Statement II: Kinetic friction is a non-conservative force.

1. Statement I is true, statement II is true and statement I is the correct reason for statement II.

2. Statement I is true, statement II is true, statement I is not the correct reason for statement II.

3. Statement I is true, statement II is false.

4. Statement I is false, statement II is true.

Statement II is true; Statement II is not the correct explanation of Statement IRead more on Sarthaks.com - https://www.sarthaks.com/196003/this-question-has-statement-and-statement-ii-the-four-choices-given-after-the-statement
Subtopic: Â Concept of Work |
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Given below are two statements:
 Assertion (A): Work done by friction on a body sliding down an inclined plane is negative. Reason (R): Work done is less than zero if the angle between force and displacement is acute or both are in the same direction.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.
Subtopic: Â Concept of Work |
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Given below are two statements:
 Assertion (A): No work is done when an electron completes a circular orbit around the nucleus of an atom. Reason (R): Work done by a centripetal force is always zero.

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 Both (A) and (R) are false.

Subtopic: Â Concept of Work |
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Given below are two statements:
 Assertion (A): Centripetal force does no work. Reason (R): Force and displacement are perpendicular to each other.

 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 Both (A) and (R) are False.
Subtopic: Â Concept of Work |
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Given below are two statements:
 Assertion (A): Work done in uniform circular motion is zero. Reason (R): Force is always directed along displacement.

 1 Both (A) and (R) are True and (R) is the correct explanation of (A). 2 Both (A) and (R) are True but (R) is not the correct explanation of (A). 3 (A) is True but (R) is False. 4 Both (A) and (R) are False.
Subtopic: Â Concept of Work |
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Consider the following Assertion and Reason:

 Assertion (A): If a man is walking on a rough road, the work done by the frictional force is positive. Reason (R): Frictional force acts in the direction of the motion of the man.

 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 a true statement but the reason is false. 4 Assertion is false but the reason is true.

Subtopic: Â Concept of Work |
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