question_answer 30)

A train runs along an unbanked circular track of radius 30 mat a speed of . The mass of the train is . What provides the centripetal force required for this purpose ? The engine or the rails ? The outer or the inner rail ? Which rail will wear out faster, the outer or the inner rail ? What is the angle of banking required to prevent wearing out of the rails ?  

Answer:

Here   The centripetal force required for the purpose is provided by the lateral thrust by the outer rail on the flanges of the wheels. By Newton's third law of motion, the train exerts an equal and opposite thrust on the outer rail, causing its wear and tear.    Angle of banking, .