no Then I will ask again. Why does a bullet stop (using the theory of only minimal wind resistence as the slowing force)? Why is a javelin not thrown more on a line? Please explain how gravity does not have an effect on the slowing process. Gravity pulls you towards the Earth. Hitting the Earth stops you, not gravity. Gravity is pulling you straight down, towards the center of the Earth. It in no way affects your momentum perpendicular to the surface (forward). Air resistance slows you down in this direction, not gravity. Again, a force pulling down doesn't slow the forward progress of an item in air? Only wind resistance slows the object? I would think these two factors worked in combination to slow items. Well I studied Genetics and wasn't that great at Physics, but I will have to respectfully disagree. No a force pulling down on an object doesn't slow movement conducted at a 90 degree angle relative to the force. So here, side ways movement is completely unaffected by gravity (ish). To be VERY technical it is, but only because of the curvature of the earth, but that's pretty much irrelevant. And no, gravity works both ways. When you're diving across. The earth is pulling you to the ground AND your body is pulling the earth up to you.