10-11-2015, 09:59 PM
(10-11-2015, 09:46 PM)Penn Wrote: Ball before being kicked is object A. This is a fixed point in relation to the surface of the Earth there for it is moving at a speed porportional to the movement of the surface of the Earth.
Goal post is object B. Also a in fixed point in in relation to the surface.
Kickers's plant leg meets the earth a point c. Also a fixed point related to the surface.
Due to the plant leg being at point C all movement of the body including the foot making contact with the ball is also moving at a rate proportional to the Earth.
When the Ball is launched from that fixed point by way of movement still in proportion to the movement of the surface the ball continues to follow a path relative to all fixed point.
Meaning - All three objects (the kinking point, uprights and ball) are moving east to west at the same rate to point which is stationary relative to the center point of the earth (meaning not attached to the surface) due to laws of motion.
Incorrect interpretation of science by the astrophysicist unless there is something I am missing.
This was just a slapped together quick response compared to how I have this in my head but I think I stated it clear enough. Too busy to go into the longer explanation.
Yes, you're missing something. It's called the Coriolis force. It's a pseudoforce that happens because the ball follows a Newtonian trajectory while the goalposts, which are attached to the Earth, continue spinning with the Earth. Now, you may not notice it, but the Earth is pretty big, and so to rotate once every 24 hours points on the surface have to move pretty fast. They move around a big circle around the Earth in 24 hours, and that's a lot of distance in that amount of time. There's some trigonometry involved, but the lateral speed at which things are moving is about 1000 miles per hour fast at the same latitude as Cincinnati. Things on the Earth are also accelerating, since they're moving in a circle. It's this acceleration that causes the apparent deflection of the football.
Analogy: think of two kids on one of those playground merry-go-rounds, sitting on either side and tossing a ball back and forth to each other as the merry-go-round spins. If the merry-go-round is spinning counterclockwise as viewed from above, the kid throwing the ball sees it veer off to the right, and the kid catching it sees it veer to the left. But someone standing on solid ground beside the merry-go-round just sees the ball go in a straight line while the kids spin in a circle.
