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akshaybansal

Friction is the parallel component of contact force.
Electromagnetic force underlies the macroscopic forces like tension, friction, etc.
If we are talking about no friction, that means, we are taking about a world where electromagnetic force is absent.
(remember that electromagnetic force is one of the four fundamental foces in nature others being gravity, stong nuclear force and weak nuclear force)
Importance of electromagnetic force :
If we reflect a little, the enormous strength
of the electromagnetic force compared to
gravity is evident in our daily life. When we
hold a book in our hand, we are balancing the
gravitational force on the book due to the huge
mass of the earth by the 'normal force'
provided by our hand. The latter is nothing
but the net electromagnetic force between the
charged constituents of our hand and
the book, at the surface in contact. If
electromagnetic force were not intrinsically so
much stronger than gravity, the hand of the
strongest man would crumble under the
weight of a feather ! Indeed, to be consistent,
in that circumstance, we ourselves would
crumble under our own weight !
Source : NCERT

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