Question 3

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 :

Statement I: The limiting force of static friction depends on the area of contact and independent of materials. This is incorrect. Static friction depends on the coefficient of friction (which depends on materials) and normal force, but is independent of area of contact.

Statement II: The limiting force of kinetic friction is independent of the area of contact and depends on materials. This is correct. Kinetic friction depends on the coefficient of kinetic friction (material-dependent) and normal force, but not on area.

Statement I is incorrect but Statement II is correct. The answer corresponds to Option (2).

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