quote:
Originally posted by Volv
quote:
Originally posted by billyy
however i think the green chain doesn't prove anything, using that no chain would ever move... so in this case it doesn't change anything but it doesn't prove anything either 
Yep, a round chain wouldn't move in any situation. However when the surfaces end at the same height then there's no net force on the green part below, therefore if there's a net force on the red (top) part, then it would cause it to move. Given that, and since we know the linked chain won't move on it's own there must therefore be no net force on the top (red) part.
I think that's what Cookie is trying to say, and it's true.
exactly... and no maths or equations involved here...
PS: will you be my personal thought translator? I'll even pay you
PS: what Volv said is almost exactly the same as what I've said the first time though... but oh well...
quote:
Originally posted by Volv
Yep, a round chain wouldn't move in any situation. However when the surfaces end at the same height then there's no net force on the green part below, therefore if there's a net force on the red (top) part, then it would cause it to move. Given that, and since we know the linked chain won't move on its own there must therefore be no net force on the top (red) part.
I think that's what Cookie is trying to say anyway, and it's true.
quote:
Originally posted by CookieRevised before people started to question each word
Think about it, what if you have something hanging from below connecting both ends of the chain. It would mean that there would be a 'force' pulling on each side equally from below no (so it doesn't matter if it is there or not)? So, if the top piece of the chain would move to some direction, it means the bottom part would move too (in the opposite direction). If that would happen, you would have a perpetual machine! Which isn't possible... hence, it would never move, no matter the angles and the lengths of the slopes, as long as both the 'bottom' parts are on a horizontal plane.
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