Question

A riddle for you
In some situations, I oppose the motion
in other situations, 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 surfaces 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!​

Answer 1

Answer:

Friction can support or oppose the motion of an object. Friction exist in pair just like Newton's third law of motion. One frictional force of this pair can support the motion of the body on which it acts and the other can oppose on which that acts and vice versa.

So the correct answer is 'Only assertion is correct'.