Why is work done by the force of gravitation on a satellite when it moves from one part of an elliptical orbit

Question

to another, but not when moves from one part of a circular orbit to another?

Answer 1

The speed of the satellite changes in an elliptical orbit. It slows as it approches the farthest part of the orbit and speeds up as it leaves the farther parts and comes closer to the planet. When it speeds up, its kinetic energy is increasing. For its kinetic energy to increase, work must have been done.

Answer 2

centrifugal force multiplies at the apex of an elliptical orbit due to the increase in angle relevant to it's position and motion, circular is constant so, without other factors such as friction and etc. not in play it's easy to see why.

Answer 3

I agree w/ weatherman. I spent a few minutes freshening up on geosynchronous orbits trying to help answer your question only to find out that you deleted it. What does it hurt to keep the question open or select a best answer and help people out who are trying to help you? It's pretty selfish to just delete the question once you've found the answer.

Answer 4

I would answer this for you.

But as you seem to delete all of your questions, as soon as you have the answer you want, and before they have been there long enough to even consider a best answer, I can't be bothered wasting my time & effort.

EDIT

PROBABLY NOT LONG FOR THIS ONE TO SURVIVE, THE OTHER ONE ASKED AT THE SAME TIME JUST DISAPPEARED