What is meaning of force of friction in physics define friction i need example also of friction only in a sheet of paper plz meritnation experts

I need proper explanation in a sheet of paper

Dear Friend ,


Force of friction can be defined as the force that resist motion when two rough surface come in contact and move with respect to each other.


For example :- a knot remains in its position due to the friction of the rope you tie it.

Regards

For example :- when we rub two sheets of paper they resists the motion of each others thus they create friction


Is this example OK ??