Formula to calculate angle of static friction

Q.  Which formula is used to calculate angle of static friction (Φs)?
- Published on 18 Sep 15

a. tan-1 μs
b. sin-1 μs
c. cos-1 μs
d. none of the above

ANSWER: tan-1 μs


  • Sravanthi   -Posted on 16 Dec 15
    - In impending motion, the angle between normal reaction and resultant reaction is known as angle of static friction.

    - In the diagram shown,

    tan Φs = (Frictional force) / (Normal reaction)

    But coefficient of static friction (μs) = (Frictional force) / (Normal reaction)

    tan Φs = (μs)

    Therefore, Φs = tan-1 (μs)

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