I have a couple of questions that i thougth this group could help me with. 1. A plane (SR71) takes off from the equator, with a lateral speed, relative to space of 1000mph. (earth rotational speed) say it takes an hour to get there so, its going 10,000mph or something. . Tt flys over the north pole. According to conservation of angular momentum, since the radius is being shortened, doesnt the plane's rotation around the earth speed up? since the radius is going down, the speed should go up. intuitively, i can see how a Coriolis effect could turn the plane to the right but it seems that there should be an effect that speeds up the spin of the plan vs what it had when it took off at the equator (say Brazil flying to the north pole) 2. The same plane takes off from Brazil and lands on the north pole. has the KE changed to PE? (because the plane was rotating with the earth (relative to space) at 1000mph and now its sitting on the north pole at 0mph. It feels like i can compare this to someone at the outer edge of a merry-go-round walking to the center (using some force) and stores up KE as PE, vs the people at the edge of the merry-go-round. ......if he walked to the center, the Coriolis effect would make him press to the left to make it to the center , otherwise he would miss the center and end up at the edge again being pulled right. (for a counterclockwise merry-go-round) 3. Someone asked me why you wouldn't feel going from 1000mph to 0 (lateral speed as you go from the equator to the north pole) over say 1 hour (in some real fast SR71 or something) i said, the speed sounds impressive and so does the change, but over an hour, the rate of change isnt. ....that's less than .01g (0.1m/s/s) , so hardly within the range of human perception.