Phy107Spr06Lect02 - Course web site u w physics.w...

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1 From last time… • Theories are tested by observations. • Different theories can predict equivalent behavior within experimental accuracy. • Simplicity or symmetry of a theory may be hints of its ‘truth’. • In some cases, a new theory forced by observations can require acceptance of radical, non-intuitive ideas. Course web site: HW 1: From March’s book Chap 1 Exercises 2, 10, 12 Chap 2 Question D; Exercises 1, 2 Arisototle’s views on motion • Aristotle’s observations VERTICAL MOTION The element earth moves down toward its natural resting place. Water’s natural place is just above earth. Air rises to its natural place in the atmosphere Fire leaps upwards to its natural place above the atmosphere. HORIZONTAL MOTION Qualitatively different. Bodies seem to need push or pull to maintain horizontal motion (contrary to their ‘natural’ motion). More Aristotle • Heavier objects should fall vertically faster than lighter ones. • Why? – Theoretically: • Heavier ones contain more of the ‘earth’ element. – Experimentally: • Light objects often observed to fall slowly • Harder to lift heavier objects • How much faster? Aristotle says proportional to their weight. Unclear why, but is simplest relation. We can do the experiment • Release two objects of different masses. Which falls faster? A. Heavier mass hits first
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Phy107Spr06Lect02 - Course web site u w physics.w...

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