Kinetic energy is the energy of mass in motion. The kinetic energy of an object is the energy it has because of its motion. For example, in order to lift a heavy object, we must do work to overcome ...

Friction is an intrinsic physical phenomenon to curling. Without it, objects in motion would move endlessly, without slowing down. This would cause many safety-related problems: Cars or trains could ...

Here, we quantify geophysical limits to wind power by applying additional drag forces that remove momentum from the atmosphere in a global climate model. We perform simulations in which drag is ...