Earth's Atmosphere and Beyond

Sir Isaac Newton

Sir Isaac Newton (December. 25,1642 - March. 31, 1727), mathematician and physicist,  was one of the foremost scientific intellects of all time.  He contributed to science by discovering  that gravitation is universal, which led to the invention of The Law Of Universal Gravitation.  Newton upon observing an apple fall from a tree, began to think about the apple acceleration.  Since its velocity changes from zero as it is hanging on the tree and moves toward the ground.  Thus by Newtons' Second Law ther must be a force that acts on the apple to cause this acceleration.  The force was called gravity and the associated acceleration was called accleration due to gravity.This suggests that gravity reaches to the top of the tall appple tree.  The Universal Law Of Gravity states that every object in the universe attracts every other object with a force directed along the line of centers for the two objects that is proportional to the square of the seperation between the two objects. F grav~ G m1 m2         Fgrav--- gravity betwen two objects                r2                      ~    --- proportional to                                              m1--- mass of object one                                     m2---  mass of object two                                      r2--- distance seperating the object                                     G--- universal gravitational constant

References:
	http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Newton.html
	http://csep10.phys.utk.edu/astr161/lect/history/newtongrav.html

Page made by: Therother Clinton