1. Why does the force of gravity on a satellite moving in an elliptical orbit vary? 2. Why does the speed of a satellite moving in an elliptical orbit vary? 3. Is it correct to say that the planets of...

1. Why does the force of gravity on a satellite moving in an elliptical orbit vary?

2. Why does the speed of a satellite moving in an elliptical orbit vary?

3. Is it correct to say that the planets of the solar system are simply projectiles falling around the Sun?