Distance-Time and Velocity-Time Graphs - Metric Gizmo Explore Learning PDF

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ASSESSMENT QUESTIONS:

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class Physics 11

Questions & Answers 1. Which graph indicates that one of runners started

ahead of the other?

A. graph A B. graph B C. graph C D. graph D

Correct Answer: A. graph A Explanation: The points on a runner's position-time graph indicate his or her location ( value) at a given time ( -value). Because both runners start at , their starting positions are the -values of their graphs when (the -intercepts). In graph A, the difference between the two runners' -values at is . So, one of the runners had a head start of . https://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=626&ClassID=5067167

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Distance-Time and Velocity-Time Graphs - Metric Gizmo : ExploreLearning

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2. In which graph are both runners moving at the same velocity?

A. graph A B. graph B C. graph C D. graph D

Correct Answer: D. graph D Explanation: The slope of a runner's position-time graph indicates his or her velocity. A faster runner will have a steeper position-time graph than a slower runner. If the runners run at the same constant velocity, then their graphs will be parallel. Graph D is the only one that shows two parallel lines.

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3. Which velocity-time graph matches the position-time graph?

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Distance-Time and Velocity-Time Graphs - Metric Gizmo : ExploreLearning

A. graph A B. graph B C. graph C D. graph D

Correct Answer: C. graph C Explanation: The position-time graph indicates that the runner runs in , stands still for , and runs in the last second. A runner's velocity is equal to the distance traveled divided by the time spent running. So, the runner's velocity is approximately for the rst second, for the next , and approximately for the last second.

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4. Which position-time graph matches the velocity-time graph?

A. graph A B. graph B C. graph C D. graph D

Correct Answer: B. graph B Explanation: The velocity-time graph indicates that the runner runs for the rst . At this velocity, the runner will be https://www.explorelearning.com/index.cfm?method=cResource.dspView&ResourceID=626&ClassID=5067167

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Distance-Time and Velocity-Time Graphs - Metric Gizmo : ExploreLearning

away from the starting line after . Then, the runner runs for two more seconds at a velocity of . (That means the runner runs at the same speed but in the other direction - back toward the starting line.) This can be modeled with a position-time graph by connecting the following points: , , and .

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5. Which sentence best describes the runner whose velocity-time graph is shown?

A. The runner ran forward for B. The runner ran forward for quickly for the last . C. The runner ran forward for slowly for the last . D. The runner stood still for more seconds.

, and then ran backward for — slowly for the rst — quickly for the rst

more seconds. , then more , then more

, moved suddenly, and then stood still again for

Correct Answer: C. The runner ran forward for , then more slowly for the last

— quickly for the rst .

Explanation: The runner's velocity is positive at all times, so the runner is running forward the whole time. But, the runner's velocity is greater in the rst than in the last . So, that indicates faster running at rst, and then slower running (but still forward) for the last .

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