Physics of "tubing" behind a boat. I have noticed that when an inflatable tube (usually with a passenger on top) is being pulled fast behind a speedboat, and the boat turns (in a sustained sharp turn), it seems as if the tube and rider achieve speeds that are faster than that of the boat itself. Does the "tuber" actually reach speeds faster than the boat? If so, how? Can someone explain the physics of this to me? I think Im having trouble picturing the forces and their directions. Thanks in advance.