Question

10. Whenever the surfaces in contact tend to move or move with respec
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.​

Answer 1

A

Here is your answer

Hope it was helpful

Answer 2

plz sorry I dont know its ans I am just doing For Points Plz dont be hurt.