Question

it is difficult to walk on muddy floor or slippery floor.(give examples for each)

Answer 1

One can walk because ground offers friction. In the case of less friction walking becomes almost impossible.
The friction is less on a slippery surface. When we push our feet while walking, it slips easily due to less friction.
Similarly,it is difficult to walk over muddy surface. This is because muddy surface offers very small friction to the surface of feet of a person.