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= Concept Map =
= Concept Map =
[[File:the sun.mm|Flash]]
= Textbook =
= Textbook =
* Kepler's third law
* Kepler's third law
===Learning objectives===
===Learning objectives===
* Kepler presented his first two laws of planetary motion in 1609 by using the notes of his predecessor ''TYCHO BRAHE'' and third law in 1619.
* Kepler developed his laws empirically from observation, as opposed to deriving them from some fundamental theoretical principles. About 30 years after Kepler died, '''Isaac Newton''' was able to derive '''Kepler's Laws''' from '''basic laws of gravity'''.
* Newton presented his law of universal gravitation as a case study of his laws of motion. All matter exerts a force, which he called gravity, that pulls all other matter towards its center. The strength of the force depends on the mass of the object: the Sun has more gravity than Earth, which in turn has more gravity than an apple. Also, the force weakens with distance. Objects far from the Sun won’t be influenced by its gravity.Hence all the planets of the solar system revolve around the SUN due to '''Strong gravitational force of the Sun'''.
* Newton’s laws of motion and gravity explained Earth’s annual journey around the Sun. Earth would move straight forward through the universe, but the Sun exerts a constant pull on our planet. This force bends Earth’s path toward the Sun, pulling the planet into an elliptical (almost circular) orbit. His theories also made it possible to explain and predict the tides. The rise and fall of ocean water levels are created by the gravitational pull of the Moon as it orbits Earth.
#States Kepler's three laws of planetary motion.
#Explains Kepler's laws of planetary motion.
===Notes for teachers===
===Notes for teachers===
''These are short notes that the teacher wants to share about the concept, any locally relevant information, specific instructions on what kind of methodology used and common misconceptions/mistakes.''
''These are short notes that the teacher wants to share about the concept, any locally relevant information, specific instructions on what kind of methodology used and common misconceptions/mistakes.''
= Fun corner =
= Fun corner =
[[Category:Science]]
