Serway_PSE_quick_ch08

Serway_PSE_quick_ch08 - Physics for Scientists and...

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Physics for Scientists and Engineers, 6e Chapter 8 – Potential Energy
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Choose the correct answer. The gravitational potential energy of a system 1 2 3 33% 33% 33% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. is always positive 2. is always negative 3. can be negative or positive
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The sign of the gravitational potential energy depends on your choice of zero configuration. If the two objects in the system are closer together than in the zero configuration, the potential energy is negative. If they are farther apart, the potential energy is positive.
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An object falls off a table to the floor. We wish to analyze the situation in terms of kinetic and potential energy. In discussing the kinetic energy of the system, we 1 2 3 33% 33% 33% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. must include the kinetic energy of both the object and the Earth 2. can ignore the kinetic energy of the Earth because it is not part of the system 3. can ignore the kinetic energy of the Earth because it is so massive compared to the object
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The reason that we can ignore the kinetic energy of the massive Earth is that this kinetic energy is so small as to be essentially zero.
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An object falls off a table to the floor. We wish to analyze the situation in terms of kinetic and potential energy. In discussing the potential energy of the system, we identify the system as 1 2 3 33% 33% 33% 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. both the object and the Earth 2. only the object 3. only the Earth
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We must include the Earth if we are going to work with gravitational potential energy.
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