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Wafa Natt
Asked: 2022-10-29T01:20:52+05:30 In:

Assertion : A sphere is placed in pure rolling condition over a rough inclined surface.Then, force of friction will act in downward direction
image
Reason : Angular acceleration (actually retardation) due to friction is anti-clockwise.
A. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion
B. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
C. If Assertion is true but Reason is fasle
D. If Assertion is false but Reason is true

Assertion : A sphere is placed in pure rolling condition over a rough inclined surface.Then, force of friction will act in downward direction
image
Reason : Angular acceleration (actually retardation) due to friction is anti-clockwise.
A. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion
B. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion
C. If Assertion is true but Reason is fasle
D. If Assertion is false but Reason is true
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1 Answer

  1. Correct Answer – D
    Linear acceleration due to `mg sin theta` is downward. Hence for pure rolling to continue, force of friction should act upwards so that angular acceleration is anti-clockwise.

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