Question Bank • QB_EXP_APE_RHE_002 NAT • 1 Mark

Section 6: Agricultural Process Engineering

Frictional & Rheological Properties of Biological Materials

Subtopic: Angle of static friction calculation

Question Statement:

Grains placed on a galvanized iron sheet begin to slide when the coefficient of static friction is $\mu_s = 0.45$. The corresponding angle of friction $\theta$ is ________ degrees (round off to two decimal places).

Answer Key:

24.23

Step-by-Step Solution & Explanation

The angle of friction $\theta$ is related to coefficient of static friction by: $\tan \theta = \mu_s \implies \theta = \tan^{-1}(\mu_s)$ Given $\mu_s = 0.45$: $\theta = \tan^{-1}(0.45) = 24.23^\circ$
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