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Old 14-March-2008, 03:05 AM
Peter B Peter B is offline
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Quote:
Originally Posted by dpstdd View Post
i gotcha becaase there is more compressed air so it flows out to release the pressure but if in a giant vac wouldn't it take a heck of a lot to move ?

thanks for responses
No, it would take less, because of friction. Think of your wheeliearmchair again. Which surface is easiest to move over? Thick shag pile carpet? Flat carpet? Or a tiled floor?

In the case of a vacuum, it offers the least resistance to movement, because there's no stuff to offer any friction.

Friction - resistance to being moved - is different from force. I think you may be confusing the two.

As for how much force is needed to move, any force will move any mass. If the force is small and the object is large, the object will move slowly. But if the force is large and the object is small, the object will move quickly. Think of how hard you can throw a shot put, and how hard you can throw a tennis ball.
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