Choose the correct optionSelect an answerAThe friction force is dependent on the roughness of surface.BThe kinetic friction is proportional to normal reactionCThe friction is independent on the area of contactDAll statement are correct.
Question
Choose the correct optionSelect an answerAThe friction force is dependent on the roughness of surface.BThe kinetic friction is proportional to normal reactionCThe friction is independent on the area of contactDAll statement are correct.
Solution
The correct option is D. All statements are correct.
Explanation: A. The friction force is indeed dependent on the roughness of the surface. The rougher the surface, the greater the friction. B. The kinetic friction is proportional to the normal reaction. This is because the kinetic friction is equal to the coefficient of kinetic friction times the normal force. C. The friction is independent of the area of contact. This might seem counterintuitive, but the area of contact does not affect the frictional force. What matters is the nature of the materials in contact and the force pressing them together.
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