I post a few statements/questions and I invite you to reflect and let us know your opinion:
- The same force which causes objects on Earth to fall to the Earth also causes objects in the heavens to move along their circular and elliptical paths. Quite amazingly, the laws of mechanics which govern the motions of objects on Earth also govern the movement of objects in the heavens.
- Newton’s comparison of the acceleration of the apple to that of the moon led to a surprisingly simple conclusion about the nature of gravity into the entire universe.
- Why planet’s orbits are elliptical and why as the planet is closest from the sun, the planet is moving fastest and as the planet is farthest from the sun, it is moving slowest.
You will get a bonus if you comment about the ideas above.
Tudor, you should be the first one reflecting and posting some ideas here.
some links that might shed light on the subject:
http://www.physicsclassroom.com/class/circles/Lesson-3/The-Apple,-the-Moon,-and-the-Inverse-Square-Law
http://www.physicsclassroom.com/class/circles/Lesson-3/Newton-s-Law-of-Universal-Gravitation
Did you know that:
Prior to Newton and Galileo, most people thought that the forces causing motion on Earth and the forces causing the stars and planets to move were different forces. Sir Isaac Newton realized that the same forces and the same laws of physics apply everywhere in the universe. So, his law of gravity is called the law of universal gravitation.
http://howthingsfly.si.edu/flight-dynamics/kepler%E2%80%99s-laws-orbital-motion
What do you mean