Originally Posted By: Orac

If gravity is just striaght line motion as you suggest I can pull myself up into the air I am exerting a force and I can put spring gauges on to a string tied to my feet and show you I am pulling. So why don't my feet come up off the ground?
So in your alternative view what is happenin here ... explain away.

I have not suggested that gravity is straight line motion, or anything to that effect (Of course, I think there is relation between speed and gravity). I just don't get what relevance your example has. Here, there is no need of an alternate explanation. Your body tries to pull your feet up and at the same time tries to keep your feet down. It is perfectly balanced.