http://www.estiloskateboards.com/skateboard-ball/
If I put a fan and a sail on a skateboard himself, would then be propelled?
Well, I figured that a skateboard (with the sail and the wind from the fan) either go forward or backward, so I say that genius and … Do not give me any of that "there are many factors to consider, such as friction surface, the amount of fat in ball bearings, if you have a tail wind 2 mph … assume that everything has to happen happens, IS IT POSSIBLE to propell a skateboard two elements of "VELA" ABOARD!
N is not going anywhere. And there are some assumptions necessary to make like there's no wind blowing in any direction. Or just doing this on the floor of ballet within a ballet studio which means, closed area, the winds, smooth surfaces. The reason for not moving is called conservation of momentum. It is because the fan is on the skateboard so it blows air forward also there is a pull back (like the decline of a gun, the bullet is launched, but the weapon back). So now the air moving forward, take the candle. Assume that air is not lost: all air from the fan is caught by the sail. So now that this air exerts a forward force on the sail. The forward force on the sail cancels retreat back into the and fan assembly as a whole does not move any direction. Another way to think of it is this: consider that you are in a railway carriage large. You move to the side and start pushing the wall. Does the car move in the direction they are pushing? No, because its thrust is canceled by the force His feet are exerting on the car. This force supports you while pushing the wall. So there are two equal forces working in the system and not moving.
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