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Lect2-ch2_2 - At the beginning of class today Hand in your...

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1 At the beginning of class today: Hand in your extra credit summaries for chapter 2 (bring them down and place them on the front podium) Hand in your CAPA problem that you printed out. (you should also neatly write on the sheet of paper your name, soc.sec.no., and the section you are registered in. Come down and pick up a PRS clicker . (any one numbered below 200; we will assign you each a specific number next week.) PHY 2053C – College Physics A Fall 2004 Motion, Forces, Energy, Heat, Waves Dr. David M. Lind Dr. Kun Yang Dr. David Van Winkle Today: Kinematics in one dimension position velocity acceleration free fall L2—Ch2
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2 Important Points from Last Lecture Labs CAPA assignments Bonus Points Mini-Exams Physical measurements require units ! We use the SI units kg, m, s for mass, length, time. Question 1&2 A) Which one of the following statements sounds right to you: 1) Objects keep a constant speed indefinitely unless I do something to them. 2) Objects tend to slow down by themselves and will stay at rest if left alone. B) Which statement is right : 1) A two pound weight will hit the ground before a one-pound weight when dropped from the same height. 2) A two pound and a one-pound weight will hit the ground simultaneously when dropped from the same height.
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3 Free Fall Galileo observed three simple, but (in view of his peers) radical facts: 1) If you do nothing on an object (and eliminate friction), it keeps going indefinitely at a constant speed.
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