The perception of increased weight is related to the uild-up of fatigue toxins in the muscles. As pointed out above, this is an atrtifact of human percpetion, not a property of wehatever mass you are supporting. A Cup - water filled or not - supported by a metal beam will not be experienced as growing heavier by that beam. Obviously.
{Closing this one down, without a bump - Adminnemooseus}
This message has been edited by Adminnemooseus, 09-21-2004 11:53 PM