# lecture10 - Today's lecture will cover Textbook Sections...

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Physics 101: Lecture 10, Pg 1 Today’s lecture will cover Textbook Sections 6.5 - 6.8 - EXAM 1: 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.

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Physics 101: Lecture 10, Pg 2 θ • Work: Transfer of Energy by Force W F = F d cos θ •Kinetic Energy (Energy of Motion) •K = ½ mv 2 • Work-Kinetic Energy Theorem: Σ W = Δ K • Potential (Stored) Energy: U
Physics 101: Lecture 10, Pg 3 What concepts were most difficult to understand in preparing for this lecture? “everything” “nothing” “conservative vs. nonconservative / Wnc” “The equations were kind of confusing…” Defining all of the terms; understanding what each of them means conceptually. sign of kinetic and potential energies. . difference between power and work don't really understand work. .. Studying for the exam

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Physics 101: Lecture 10, Pg 4 Example 1: Drop ball Y i = h Y f = 0 W g = (mg)(d)cos θ d = h W g = mghcos(0 0 ) = mgh Δ y = y f -y i = -h W g = -mg Δ y mg d y x Y i = h Y f = 0 mg y x
Physics 101: Lecture 10, Pg 5 Example 2: Toss ball up W g = (mg)(d)cos θ d = h W g = mghcos(180 0 ) = -mgh Δ y = y f -y i = +h W g = -mg Δ y Y f = h Y i = 0 mg d y x

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## This note was uploaded on 02/05/2012 for the course PHYS 101 taught by Professor Ha during the Spring '11 term at University of Illinois at Urbana–Champaign.

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lecture10 - Today's lecture will cover Textbook Sections...

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