Multiple choice

On which of the following factors does frictional force not depend?

  1. The nature of surfaces in contact

  2. The state of smoothness of two surfaces in contact

  3. How hard the two surfaces press together

  4. The size of the contact area
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Frictional force does not depend upon the size of the contact area.

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