JEE Mains · Physics · STD 11 - 4.2 friction

Given below are two statements: \(Statement\) \((I)\) : The limiting force of static friction depends on the area of contact and independent of materials. \(Statement\) \((II)\) : The limiting force of kinetic friction is independent of the area of contact and depends on materials. In the light of the above statements, choose the most appropriate answer from the options given below:

A Statement \(I\) is correct but Statement \(II\) is incorrect
B Statement \(I\) is incorrect but Statement \(II\) is correct
C Both Statement \(I\) and Statement \(II\) are incorrect
D Both Statement \(I\) and Statement \(II\) are correct

Verified Solution

Answer & Solution

Correct Answer

(B) Statement \(I\) is incorrect but Statement \(II\) is correct

Step-by-step Solution

Detailed explanation

Co-efficient of friction depends on surface in contact So, depends on material of object.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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