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Here is MY take on John's Force = Flow of momentum. (reafication???)
Each of the three strings is providing the same flow of momentum
whether there is equilibrium or NOT.
In equilibrium we require that the (vector) summ of these flow add up
to zero.
Just like requiring the three Forces to add up to zero.
Force is identical to momentum flow and vice-versa.
At 7:38 AM -0800 11/18/03, Ludwik Kowalski wrote:
A ring resting on a horizontal table is pulled radially
(away from the center) by three strings. The other
sides of stings are attached to suspended masses
(via pulleys). In other words, it is a classical force
table activity on static equilibrium. Who is transferring
momentum to whom?