Question

1
Whenever the surfaces in contact tend to move or move with
respect to each other, the force of friction comes into play
(a) only if the objects are solid.
(b) only if one of the two objects is liquid,
(c) only if one of the two objects is gaseous,
(d) irrespective of whether the objects are solid, liquid or gaseous,
2.​

Answer 1

Answer:

(d) Irrespective of whether the objects are solid, liquid or gaseous,

Explanation:

Friction occurs irrespective of state of the matter. Friction provided by liquids and gases are known as fluid friction.