Recent content by reiternick

Am I at least right in saying that for any kind of wheel or ball, there is only static friction at play since nothing is being dragged across another surface?

I don't know if you guys have heard that, when a railroad car is about to start moving, railroad operators sometimes have the train go backwards a little bit at first, that way when they move forward the force of the engine car only has to overcome the Static friction of one cart at a time, as...