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Lecture6 - Lecture 6 Gravity 2-dimensions Quiz This Friday...

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Lecture 6 Gravity, 2-dimensions
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Quiz This Friday! Covers Chapter 1 and 2 only! Things to bring 1. #2 Pencil 2. Scantron (red – half-sheet) 3. 3x5 Index card “cheat sheet” 4. Scientific calculator – graphing ok, No cell phone calculator!
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Last Time Kinematic equations
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Falling Bodies Objects moving under the influence of only gravity are said to be in free fall. Before 1600, it was widely believed that heavier bodies fell faster than lighter bodies. People at the time believed speed of the fall of the object is proportional to how heavy it is. Galileo was the first to predict that falling bodies on earth would fall with a distance proportional to time- squared (d~t 2 )
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Galileo’s Test Leaning tower in Pisa Dropped two balls of equal size, but one was soap and one was lead. Both sphere’s reached the ground at the same time.
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1971 Apollo 15 and Galileo Exp. http://www.youtube.com/watch?v=4mTsrRZEMwA Transcript of the video: http://www.hq.nasa.gov/alsj/a15/a15.clsout3.html#1671628 167:22:06 Scott: Well, in my left hand, I have a feather; in my right hand, a hammer. And I guess one of the reasons we got here today was because of a gentleman named Galileo, a long time ago, who made a rather significant discovery about falling objects in gravity fields. And we thought where would
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