Gravitationand space science.

1. Who was Isaac Newton?
2. If you were in the place  of Issac Newton,what would you have done with the apple?
3. What does the force of gravitation depend on?
4. Who was Ptolemy? What was his contention?
5. Who was Copernicus? What is heliocentric theory?
6. Who was Tycho Brahe? What is his contribution?
7. What did Johannes Kepler do with the data  of Tycho Brahe?
8. What are the fundamental forces of nature?
9. Which  is the weakest among them?
10. What is Newton's Law?
11. What are the features of Newton's law of gravitation?
12. When does the value of acceleration  decreases?
13. when does it become zero at the center of  the earth?
14. Define gravitational potential at a point.
15. when is it at maximum and  and  will have a negative value/
16. What is a satellite?
17. Define Escape velocity.
18. Define orbital velocity.
19. What do you know about geostationary satellite?
20. What is the time period of the  satellite?
21. What is  the inertial mass of a body?
22. What is gravitational  mass?
23. What is a rocket?
24.