How does friction affect trains?
How does friction affect trains? Friction acts to prevent or resist relative motion between the two surfaces. So, if there is a torque on the wheels and the point of contact can not move relative the rail (just where it touches) because of static friction, the only way the wheel can turn is if the train moves relative the wheel.
Why are trains not aerodynamic?
Why aren't subway trains aerodynamic? Speed and capacity are the main reasons. In terms of speed, a lot of it has to do with how frequently the train starts and stops, as well as the track conditions.
Do trains use friction brakes?
Braking performance required for the railway vehicle is among the most important criterions in choosing type of the braking system. Two most common types of friction brakes used currently in railway vehicles are tread brake and disc brake.
How do trains not slip?
To help the wheels stay on the track their shape is usually slightly conical. This means that the inside of the wheel has a larger circumference than the outside of the wheel. (They also have a flange, or raised edge, on the inner side to prevent the train from falling off the tracks.)