Assertion (A): | Work done by friction is always negative. |
Reason (R): | Kinetic friction is a non-conservative force. |
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. | (A) is False but (R) is True. |
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. |
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. |
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. |
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. |
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. |