08_30_Describing_Motion_2

08_30_Describing_Motion_2 - 8/30 Describing Motion, Vectors...

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8/30 Describing Motion, Vectors / Text sections 2.1-3 and 1.5-6 / HW “8/30 Acceleration” due Thur 9/5 On web or in 213 Witmer for copying
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Direction requires a statement about which way is pos. and neg. Must keep track of minus signs Imagine a bead on a wire, a ruler, and a timer. time ruler reading 0 0 1 6 2 8 3 6 4 0 5 ? x = 6 x = 2 x = -2 x = -6 x = ? v ave = 6m/s v ave = 2m/s v ave = -2m/s v ave = -6m/s v ave = ?m/s t = 1 t = 2 t = 3 t = 4 t = 5 t = 0 v = 4m/s v = 0m/s v = -4m/s v = -8m/s v = -12m/s v = 8m/s What is the instantaneous velocity v when: -10 m/s -10 -10 Rather that keeping track of signs, use arrows, let right be positive.
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Examples of Vectors 30° 16m/s An object moving at 16m/s directed 30° above the horizontal 30° 10m/s The same object moving at 10m/s directed 30° above the horizontal Note that the length corresponds to the magnitude
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Vectors / Quantities with direction / Which quantities are vectors? temperature velocity force volume acceleration mass / Vectors have two parts, magnitude and direction
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Question: / A ball rolls up a ramp as shown in the strobe photograph. Which way does the acceleration point or does the acceleration = 0?
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08_30_Describing_Motion_2 - 8/30 Describing Motion, Vectors...

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