Correct the following statements:

(i) Friction is an example of non-contact forces.

(i) Friction is the force that helps the motion of two surfaces concerning each

other.

(ii) It is difficult to walk on an oily surface because of the presence of a force of friction.

(iu) Friction does not cause heating of the surfaces in contact.

() Friction mainly depends on the area under contact.

(vi) Friction is independent of the nature of surfaces.

(vii) Friction can neither be increased nor decreased.​