Physics131 Power Point Lectures

Physics131 Power Point Lectures - Sadiaghiani Power Points

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Physics 131 - Mechanics Lecture 19 Chapter 11.4-7 WORK March 4 , 2009 Homeyra Sadaghiani hrsadaghiani@csupomona.edu
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9 1-Mar 19 Work, force, potential energy 11.4-6 (12 P)   3-Mar 20 Conservation of energy, power 11.7-9 (9 P) HW#8   5-Mar 21 Rotational motion, center of mass 12.1-3 (8 P) 10 8-Mar 22 Moment of inertia, Torque, static equilibrium 12.4-8 (7 P)   10-Mar 23 Rotational dynamics, final assessment 12.5-11 (20 P) HW#9   12-Mar R Review   19-Mar FINAL EXAM 11:30 A.M.-1:30 P.M. 3-2137 - Comprehensive Schedule 131.03 11:00-12:00 We are here!
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9 1-Mar 19 Work, force, potential energy 11.4-6 (12 P)   3-Mar 20 Conservation of energy, power 11.7-9 (9 P) HW#8   5-Mar 21 Rotational motion, center of mass 12.1-3 (8 P) 10 8-Mar 22 Moment of inertia, Torque, static equilibrium 12.4-8 (7 P)   10-Mar 23 Rotational dynamics, final assessment 12.5-11 (20 P) HW#9   12-Mar R Review   17-Mar FINAL EXAM 11:30 A.M.-1:30 P.M. 3-2137 - Comprehensive Schedule 131.04 12:00-1:00 We are here!
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October 24, 2008 Physics 114C - Lecture 16 4/24 Work Done by a Constant Force If there is more than one force acting on an object, we can find the work done by each force, and also the work done by the net force: (7-5)
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March 2, 2009 Physics 131 - Lecture 18 5 Work on a System with Many Forces total 1 1 2 2 3 3 x x x W F x F x F x = ∆ + + + L Model the system as a particle a single x total 1 2 3 1 2 3 net ( ) x x x x x x x W F x F x F x F F F x F x = ∆ + ∆ + ∆ + = + + + = L L
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March 2, 2009 Physics 131 - Lecture 18 6 Work-Kinetic-Energy Theorem net x x F ma = 2 2 2 f i x v v a x = + ( 29 2 2 1 2 x f i a v v x = - ( 29 1 1 1 2 2 2 2 net 2 2 2 x x f i f i F x ma x m v v mv mv ∆ = ∆ = - = - 1 1 2 2 total 2 2 f i W mv mv = - 1 2 2 Define Kinetic Energy: K mv total f i W K K K = - = ∆
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Work and Kinetic Energy As the particle is moved by this single force, its kinetic energy changes as follows: March 2, 2009 7 Physics 131 - Lecture 18 To change a particle’s energy, a force must be applied as the particle under goes a displacement. The net work done on the particle by these forces causes the particle’s kinetic energy (as a result of change in speed) to change.
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A. W g and W T are both zero. B. W g is negative and W T is negative. C. W g is negative and W T is positive. D. W g is positive and W T is positive. E. W g is positive and W T is negative. A crane lowers a steel girder into place at a construction site. The March 2, 2009 8 Physics 131 - Lecture 18 Clicker Question
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graph. If the particle has 2.0 J of kinetic energy as it passes x = 0 m, what is its kinetic energy when it reaches x = 4 m? A. 0.0 J
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Physics131 Power Point Lectures - Sadiaghiani Power Points

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