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

Friction- A necessary evil

Answer 2

The Answer Is Friction

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