The temperature of the track rises when the train is running on it The teacher said that this is the same as the friction between hands, overcoming the friction to do work I mainly want to understand why the temperature of the rail rises because of work Can it be understood as follows: When the train is running, it overcomes the friction to do work, and the internal energy increases and the temperature rises; Because the friction is mutual, the rail is also subject to friction. If the train is taken as a reference, the rail is moving and works against the friction Is that right?

The temperature of the track rises when the train is running on it The teacher said that this is the same as the friction between hands, overcoming the friction to do work I mainly want to understand why the temperature of the rail rises because of work Can it be understood as follows: When the train is running, it overcomes the friction to do work, and the internal energy increases and the temperature rises; Because the friction is mutual, the rail is also subject to friction. If the train is taken as a reference, the rail is moving and works against the friction Is that right?

When a train works against friction, its internal energy increases and its temperature rises
Because friction is mutual, so the rail is also subject to friction
If a train is taken as a reference, the track is moving and doing work against friction
In order to do work by friction, it is necessary for the exerting object and the stressed object to contact and rub each other. The effect of doing work increases the internal energy of both objects. That is to say, the effect is the same whether the train does work or the rail does work. When calculating the increase of internal energy, only the work done by one friction can be calculated, and the work done by the acting force and the reaction force can not be calculated separately and then added up