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The angle of the inclination of wedge over which the block is sliding is determined by which of the following trigonometric function?

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The angle of the inclination of wedge over which the block is sliding is determined by which of the following trigonometric function?

(a) Tangent Inverse

(b) Cosine

(c) Sine

(d) Secant

This question was posed to me in an interview for internship.

This key question is from Characteristics of Dry Friction topic in chapter Friction of Engineering Mechanics

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Right answer is (a) Tangent Inverse

To explain I would say: The angle of the wedge over which the block is being slided is generally taken out by the help of the tangent inverse trigonometric function. It is the ratio of the frictional force to the normal force. This ratio is kept inside the inverse function.

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