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?

Question

Philoid · Accepted Answer

Yes, there is a force of friction between the wheels of a moving train and iron rails because both the surfaces are in contact.

⇒ The type of friction present is rolling friction.

Note: When one body rolls over the other surface of another body, rolling friction into play.

⇒ If an aircushion is introduced between the wheel and the rail, the force of friction decreases because now there is no contact between wheels and rails.