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Message: [QUOTE="Jeff Gilbert, post: 199073, member: 20280"] Understand but is resistance considered and "outside force" even if the wind is constant? If you were to "whip" the bike sideways after leaving the face of a jump (like some of the more experienced riders than me) the CG would still be the same, correct? This would create more resistance in the air, limiting the "fly time" thus changing the trajectory and shortening the arc however it does change the opposing variable even though the wind is constant. My example would be to jump off of a cliff holding vertically a sheet of plywood, the plywood and myself would cut throught the air like a knife. If I were to then jump off the same cliff with the same sheet of plywood only this time I was sitting on it, the CG would still be the same only I would reduce the speed of descent by incurring more resistance. I have not changed the CG and have the same propelling force for my examples. My emphasis here is to illustrate that you must consider resistance as variable because you have not changed the center of gravity, yet you will land sooner than you would without increasing resistance. This is of coarse taking into account that wind drag is not considered an outside force since the wind velocity has not changed and it will always be a part of the equation. Not looking for the great debate here, I would just like to read your thoughts as an educator.:think [/QUOTE]