Question

why is it necessary to separate contact force into a normal force and frictional force? give at least two reasons. ​

Answer 1

Answer:

That is so because normal force acts with the movement of the body while the frictional force acts against the body. So, we can’t add the force to get equivalent force due to the direction of the individual forces. To get accurate calculations of equivalent force we separate contact force into normal force and frictional force