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haridas_mandal Group Title

Consider the two statements : Statement A : Frictional Force can be zero even though the contact surface is rough. Statement B : Even though there is no relative motion between surfaces, friction force force may exists between them. Options a) Both A & B are true b) A is true B is false. c) A is false but B is true. d) Both A & B are false. Which and why is the right answer?

  • one year ago
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  1. Vincent-Lyon.Fr Group Title
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    Both are true.

    • one year ago
  2. haridas_mandal Group Title
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    Pl explain as my daughter has answered option c as correct and she needs to know why she is not correct?

    • one year ago
  3. Vincent-Lyon.Fr Group Title
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    If the contact surface is horizontal, and the object on it is at rest, without any sideways force pushing on it, then frictional force will be zero.

    • one year ago
  4. Vincent-Lyon.Fr Group Title
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    The only contact force will be the normal force opposing weight of the object.

    • one year ago
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