Dear Dipesh,

he force on an object in contact with a surface can be resolved into a component perpendicular to the surface at a given point (the normal force), and a component parallel to the surface (the tangential force). In particular, a mass of weight w = mg on an inclined plane at an angle  to the horizontal will have normal and tangential forces of

 

respectively, where g is the gravitational acceleration, which essentially points to the center of the Earth.

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Law of tangents

From Wikipedia, the free encyclopedia

Figure 1 – A triangle. The angles α, β, and γ are respectively opposite the sides a, b, and c.