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Remember: This Week Read Ch. 6 (Work & Energy): En6re chapter. Begin to read Ch. 7 (Momentum): Ch. 7.1, 7.2. CAPA assignment #8 is due this evening at 10 PM, to be done on‐line. Lab next week : Energy & Momentum. Do and print Prelab prior to the Lab Session. Includes Momentum, which we won’t begin to discuss un6l next Wednesday’s lecture. L23 F 3/6/09 1 Physics 2010

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L23 F 3/6/09 Physics 2010 2 Ch. 6 Energy What’s Energy? – hard to define, comes in many forms Definition: Energy is the ability to do “Work” . Energy is such a useful concept because it is “ Conserved” . To understand energy, its interconversion to different forms, and its conservation, we must first define some terms: 1. Work 2. Kinetic Energy (KE) 3. “Work-Energy Principle” 4. Potential Energy (PE)
L23 F 3/6/09 Physics 2010 3 Component of “specific” force along displacement x displacement KE = 1 2 mv 2 W net = W Fnet = Δ KE = KE f - KE i (Applies when the object has constant “internal potential energy”.) 1. Work: 2. Kinetic Energy: 3. Work – Energy Principle:

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L23 F 3/6/09 Physics 2010 4 A 1 kg mass is moved part way around a square loop as shown.
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