Question

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

(a) Tangent Inverse

(b) Cosine

(c) Sine

(d) Secant

The question was posed to me during an internship interview.

I'm obligated to ask this question of Characteristics of Dry Friction in section Friction of Engineering Mechanics

Answer 1

Right choice is (a) Tangent Inverse

For explanation 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. Whether it may be the static or the kinetic friction, the ratio is the frictional force to the normal force. And this ratio is kept inside the inverse function.