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?


NCERT Class VIII
Science - Exemplar Problems

Chapter 12. Friction

Answer 1

Three types of frictions can be observed between the train and the iron rails.

• Rolling Friction- Rolling friction is when the train is moving on the iron rails.

• Kinetic Friction-When the brakes are applied, the friction present in between trail and iron rails is kinetic friction

• Static Friction-When the train is at rest.