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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 [email protected]

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9 1-Mar 19 Work, force, potential energy   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!
9 1-Mar 19 Work, force, potential energy   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 Doneby a Constant Force If there is morethan oneforce acting on an object, wecan find thework doneby each force, and also thework doneby the net force: (7-5)
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 = - = ∆
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 areboth zero. B. W g is negativeand W T is negative. C. W g is negativeand W T is positive. D. W g is positiveand W T is positive. E. W g is positiveand 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
A particlemoving along thex-axis experiences theforceshown in the graph. If theparticle 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 B. 2.0 J C. 6.0 J D. 4.0 J E. 2.0 J March 2, 2009 9 Physics 131 - Lecture 18 Clicker Question

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A car traveling to the right with a speed v brakes to a stop in a distance d. What is the work done on the car by the frictional force F? (Assume that the frictional force is constant). F v d 10070003v1_1 A. W = Fd B. W = -Fd C. W = 0 D. W = Fv E. W = - Fv March 2, 2009 10 Physics 131 - Lecture 18 Clicker Question
February 5, 2009 Physics 114A - Lecture 16 11/28 Example : Pulling a Suitcase A ropeinclined upward at 45 o pulls a suitcase through theairport. Thetension on theropeis 20 N.

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Physics131 Power Point Lectures - Sadiaghiani Power Points

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