Question

Question 15
Is there a force of friction between the wheels of a moving train and iron rails? If yes, name the type of friction. If an air cushion can be introduced between the wheel and the rail, what effect will it have on the friction?

Answer 1

Yes, the force of friction between the wheels of a moving train and iron rails is rolling friction.
If an air cushion is introduced between the wheel and the rails, the friction will decrease.