Question

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:
Yes, rolling friction. If an air cushion is introduced between the wheel and the rails, the friction will decrease.

Answer 1

yes the friction will reduce but for very less time as cushion would be thread after that train will soon reach to its speed before cushion was thread

Answer 2

I hope this is helpful to you