Question

Why is it necessary to separate contact force into a normal force and frictional force?​

Answer 1

Answer:

Friction always acts to oppose any relative motion between surfaces. Hence it is necessary to separate these two forces as they work in opposite direction in a same body and movement of a body depends on them.

Explanation:

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Answer 2

Answer:

Friction always acts to oppose any relative motion between surfaces. Hence it is necessary to separate these two forces as they work in opposite direction in a same body and movement of a body depends on them.