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Formula to calculate angle of static friction
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Engineering Mechanics
Q. Which formula is used to calculate angle of static friction (Φ
s
)?
- Published on 18 Sep 15
a.
tan
-1
μ
s
b.
sin
-1
μ
s
c.
cos
-1
μ
s
d.
none of the above
ANSWER: tan
-1
μ
s
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Discussion
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 Φ
s
= (Frictional force) / (Normal reaction)
But coefficient of static friction (μ
s
) = (Frictional force) / (Normal reaction)
tan Φ
s
= (μ
s
)
Therefore, Φ
s
= tan-1 (μ
s
)
➨
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