Shoutbox

quote:

---

Originally posted by billyy
Are you saying that when the surfaces end at the same height the angle of the first slope will allways cancell out the size of the chain on the second slope?

So none of these would move?

Because that was whut i was thinking...

---

That's what the maths says

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 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.