Question

Riddle based on friction​

Answer 1

Answer:

Riddle on friction :

In some situations , I oppose the motion in other situation , I facilitate the motion but I always oppose the relative motion between two moving surfaces , put some lubricant and I become small there .Make the moving surface rough I make the movement tough. I may be static sliding or rolling but whenever two surfaces are in motion I am always there .Tell me who I am ??

Explanation:

answer : friction