lec9 - L ECTURE 9 E NERGY Work Kinetic Energy Potential...

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L ECTURE 9: E NERGY Work Kinetic Energy Potential Energy Conservation of Energy
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“Work” is Force times Distance, W = Fd Wilson
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Is Work done here? Wilson
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Only the force parallel to the motion counts towards Work Wilson
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Kinetic Energy depends on Mass and Speed Brancazio
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Gravitational Potential Energy depends on height since gravity is vertical Wilson.
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Elastic Potential Energy Hay
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Elastic Potential Energy Hay
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Wilson. 1. When does a weight lifter do work? (a) When lifting the weight (b) When holding the weight over his head (c) Both of these (d) None of these
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2. Which weight lifter did more work? (The barbells have the same mass.) (a) The one on the left (b) The one on the right (c) Both the same 3. Which barbell has more potential energy? (a) The one on the left (b) The one on the right (c) Both the same
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4. No work is done by gravity on a bowling ball that rolls along a flat bowling alley because (a) no force acts on the ball. (b) no distance is covered by the ball. (c) the force on the ball is at right angles to the ball’s motion. (d) its kinetic energy remains constant (e) Actually, gravity does do work on the bowling ball. 5. A football that has kinetic energy must be (a) moving (b) falling (c) at an elevated position (d) at rest (e) none of these
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6. A tennis ball is served at 60 mph. If it is served at 120 mph, its kinetic energy is (a)four times as large (b)twice as large (c)neither of these
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Conservation of Energy in Free Fall Hewitt
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Benson
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This note was uploaded on 12/12/2011 for the course PHYS 17 taught by Professor Mcwilliams,r during the Fall '08 term at UC Irvine.

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lec9 - L ECTURE 9 E NERGY Work Kinetic Energy Potential...

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