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GRAVITY’S ROLE ON EARTH I can explain gravity’s affect on orbital motion. WHAT WAS GALILEO GALILEI’S THEORY? oGalileo said that if he dropped two balls from the Leaning Tower of Pisa, they would hit the ground at the same time. oHe was right! That led him the to law of freely falling bodies. oThere is no evidence that he actually did it, but he was the first scientist to use the results from experiments for evidence for a scientific theory. WHAT IS EXACTLY GRAVITY??? oGravity is a force of attraction between two objects. oAll objects with mass have gravity. oGravity acts like a magnet - pulling objects together. What causes gravity is not really known. WHAT WOULD HAPPEN WITH GRAVITY IF YOU WERE ON THE MOON? oApollo 11- http://www.youtube.com/watch?v=5MpwArxmbns oThat was kind of like dropping a piece of paper and feather. oThe moon is 1/4 the size of Earth, so the moon's gravity is much less than the earth's gravity, 83.3% (or 5/6) less to be exact. oIf you were 100 pounds on the earth, you would be 16.6 pounds on the moon. GRAVITY’S EFFECTS ON HUMANS… oGravity is not just a force, it’s also a signal that tells the body how to act. oFor one thing, it tells muscles and bones how strong they must be. oMuscle mass can vanish at a rate as high as 5% a week. oBlood also feels gravity HOW DOES IT EFFECT THE PLANETS AND MOVING? oGravity is a very important force. Every object in space exerts a gravitational pull on every other, and so gravity influences the paths taken by everything traveling through space. oIt is the glue that holds together entire galaxies. oIt keeps planets in orbit. o It makes it possible to use human-made satellites and to go to and return from the Moon. SITES: HTTP://LIBRARY.THINKQUEST.ORG/29033/HISTORY/GA LILEO.HTM HTTP://WWW.MOONCONNECTION.COM/MOON_GRAVIT Y.PHTML HTTP://WWW.QRG.NORTHWESTERN.EDU/PROJECTS/VSS /DOCS/SPACE-ENVIRONMENT/ZOOM-GRAV.HTML