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Mechanical Properties of Solids — Physics STD 11 Science — Question

Maharashtra BoardEnglish MediumSTD 11 SciencePhysicsMechanical Properties of Solids2 Marks
Question
State the laws of static friction.
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Answer

Laws of static friction:
  1. First law: The limiting force of static friction $(F_L)$ is directly proportional to the normal reaction (N) between the two surfaces in contact.
    $F_L ∝ N$
    $\therefore F_L = µ_s N$
    where, $µ_s$​​​​​​​ = constant called coefficient of static friction.
  2. Second law: The limiting force of friction is
    independent of the apparent area between the surfaces in contact, so long as the normal reaction remains the same.
  3. Third law: The limiting force of friction depends upon materials in contact and the nature of their surfaces.

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