Question #afa31

1 Answer
May 4, 2016

Answer:

We are discussing inclined plane here which makes an angle #theta# with the horizontal.

Explanation:

enter image source here
The weight #W=mg# of the body acts vertically downwards as shown in the figure.

The Normal reaction force #R# which is perpendicular to the surface of the inclined plane and is therefore, equal and opposite to the #c osi n e# component of the weight of the body. See the geometry, and angle #theta#

#:. vec R=-mcdotvecgcostheta#, or considering only the scalar parts

#R=mcdotgcostheta#