week1-3 - To summarize the cars velocity information, let...

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To summarize the car’s velocity information, let the horizontal axis represent time , and the vertical axis represent velocity . The velocity is constant wherever the slope of the distance-vs-time graph is constant. The velocity changes only when the distance graph’s slope changes.
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In the graph shown, is the velocity constant for any time interval? a) Yes, between 0 s and 2 s. b) Yes, between 2 s and 4 s. c) Yes, between 4 s and 8 s. d) Yes, between 0 s and 8 s. e) No, never. The velocity is a constant value between 0 s and 2 s. The velocity is not changing during this interval, so the graph has a zero (flat) slope.
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A car moves along a straight road as shown. Does it ever go backward? a) Yes, between 0 s and 2 s. b) Yes, between 2 s and 4 s. c) Yes, between 4 s and 6 s. d) No, never. Although the velocity is decreasing between 4 s and 6 s, the velocity is still in the same direction (it is not negative), so the car is not moving backward.
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1/7/2011 4 V(m/s) t(sec) 6.0 0.0 10.0 How long a distance did this car go? The total distance 6.0 m/s X 10 s = 60 m
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1/7/2011 5 V(m/s) t(sec) 6.0 0.0 10.0 How long a distance did this car go? In each slice, velocity is ~ constant. Add all slice up, one have the total distance The total distance is the area covered by the velocity .vs. time graph.
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During which time interval is the distance traveled by the car the greatest? a)
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This note was uploaded on 04/23/2011 for the course PHYS 214 taught by Professor Staff during the Spring '08 term at Purdue.

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week1-3 - To summarize the cars velocity information, let...

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