Serway_PSE_quick_ch02

Serway_PSE_quick_ch02 - Physics for Scientists and...

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Physics for Scientists and Engineers, 6e Chapter 2 – Motion in One Dimension
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Under which of the following conditions is the magnitude of the average velocity of a particle moving in one dimension smaller than the average speed over some time interval? 1 2 3 4 25% 25% 25% 25% 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. A particle moves in the + x direction without reversing. 2. A particle moves in the - x direction without reversing. 3. A particle moves in the + x direction and then reverses the direction of its motion. 4. There are no conditions for which this is true.
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If the particle moves along a line without changing direction, the displacement and distance traveled over any time interval will be the same. As a result, the magnitude of the average velocity and the average speed will be the same. If the particle reverses direction, however, the displacement will be less than the distance traveled. In turn, the magnitude of the average velocity will be smaller than the average speed.
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This note was uploaded on 01/19/2010 for the course PHYS 200 taught by Professor Davies during the Spring '08 term at Roger Williams.

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Serway_PSE_quick_ch02 - Physics for Scientists and...

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