# lecture09 - Exam II Today's lecture will be on Textbook...

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Physics 101: Lecture 9, Pg 1 Today’s lecture will be on Textbook Sections 6.1 - 6.4 Exam II

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Physics 101: Lecture 9, Pg 2 -7 pm, see course site for room assignments -5:15 pm conflict exam. You are signed up for the regular exam. Go to gradebook and change to conflict exam if you need to. Deadline for changing your exam time is 10 pm Thursday Sep 29. -Contact Professor Selvin if you can not do either exam.
Physics 101: Lecture 9, Pg 3 Forms Kinetic Energy Motion (Today) Potential Energy Stored (Wednesday) Heat later Mass (E=mc 2 ) phys 102 Units: Joules = kg m 2 / s 2 12

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Physics 101: Lecture 9, Pg 4 Energy is “Conserved” meaning it can not be created nor destroyed Can change form Can be transferred Total Energy does not change with time. This is a BIG deal! 10
Physics 101: Lecture 9, Pg 5 Force to lift trunk at constant speed Case a T a – mg = 0 T = mg Case b 2T b - mg =0 or T = ½ mg But in case b, trunk only moves ½ distance you pull rope. F * distance is same in both! T a mg T b T b 15 W = F dcos( θ )

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Physics 101: Lecture 9, Pg 6 Only component of force parallel to direction of motion does work!
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lecture09 - Exam II Today's lecture will be on Textbook...

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