I was talking on another forum about an idea someone proposed. They said if you put a miniature wind turbine as a Hood Ornament on a car, as the car drives, it would produce extra usable energy. I said this would not work as if the wind is not blowing at the correct angle and velocity then the wind turbine on the car would actually slow it down to a minute degree. Meaning, the friction between the air and the wind turbine would slow down the car(to a very small degree) and the car would have to speed up to compensate for the loss of kinetic energy. The energy used to speed up the car to make up for the loss would be greater than the energy produced by the turbine meaning the energy consumption is being increased even more. Who is correct and can you explain why? I've already tried to explain that the energy has to come from somewhere to move the wheel, and if it isn't coming from the non-moving air then it must be coming from the car.