Topic Energy PHYSICS 231 Current Assignments Homework Set 3 due this Friday Feb 4 11 pm Set 4 will be due next week Thursday Feb 10 11 pm Midterm exam on Thursday 2 17 Reading for next week Chapters 9 1 5 10 9 6 01 14 2019 Physics 231 Spring 2011 2 Key Concepts Work with angle between force and displacement positive and negative work Isolated system Work transforms one form of energy into another Determination of kinetic energy gravitational potential energy and spring energy of a system Energy conservation Power and its relation to velocity 01 14 2019 Physics 231 Spring 2011 3 Clicker quiz Which problem can be solved by energy conservation The cliff diver runs and jumps with a given initial speed and angle off a cliff of given height A How long does it take him to hit the water B What is his final speed C What is his final horizontal velocity component D What is the total length of his trajectory E How far from the cliff does he hit the water 01 14 2019 Physics 231 Spring 2011 4 Clicker Quiz What does it mean Energy is conserved A The total energy of a system does not change B Each form of energy in an isolated system on which no external work is done stays constant C Energy can be converted from one form into another The increase decrease of the energy in one form equals the decrease increase of energy in the other form E The change of the total energy of a system equals the amount of energy entering or leaving the system 01 14 2019 Physics 231 Spring 2011 5
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