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Northern Virginia Community College *

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201

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Physics

Date

Apr 3, 2024

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pdf

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1

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Time (secs) Velocity (km/hr) Velocity Converted to m/s 5 370 10 486 15 577 20 716 25 803 30 862 35 927 40 1005 45 1092 50 1206 55 1347 60 1537 65 1749 70 1970 75 2199 80 2464 85 2748 90 3048 95 3374 100 3714 105 4140 110 4512 115 4965 120 5379 125 5792 130 6259 135 6709 140 6746 145 6633 150 6612 155 6653 160 6698 102.77 135 160.27 198.88 223.05 239.44 257.5 279.16 303.33 335 374.16 426.944 485.83 547.22 610.83 684.44 763.33 846.66 937.22 1031.66 1150 1253.33 1379.16 1494.16 1609.88 1738.61 1863.61 1873.88 18425 1836.66 1848.05 1860.55 "Scatter plot", do not connect the data. 4. Paste a copy of thi(?raph here. (Keep your Excel file). D o ] Velocity in Seconds - 8,000 00 - . 0 [] O}M" 4,000 / ) e Velocity (km/hr) g 40 60 80 100 Time (secs) Tir . Make a graph of velocity vs. time using the data with units of m/s. The velocity should be on the vertical y-axis and the time on the horizontal x-axis. Use {] . . The last part of your data should show a much different shape than the initial data. At about what time does this change happen? What happens in the video at that moment? Why does this cause the shape of the graph to change? . Note: Future questions will refer to the data prior to the time you identified in the previous question. . Without doing any calculations, write what happens to the acceleration of the rocket as time progresses starting from the beginning of the motion? How do you know from looking at the graph? . Think of some reasons why the acceleration behaves the way you described in the previous question. What is going on with the rocket that may cause this? . About 1 minute and 35 seconds after launch, the announcer makes a comment about the acceleration of the rocket. What is the exact phrase that the announcer uses to describe this acceleration? . Based on what the announcer says, calculate the value of the acceleration of the rocket in units of m/s? at this time. . Use your data for the time interval (100, 150) s and make another "Scatter Plot" of velocity versus time. Velocity should be on the y-axis and time on the x-axis. . Using the built-in linear regression function in Excel, determine the equation for the line of best for the graph. Ask to show the equation. . Paste here a copy of this graph with the best-fit line and equation shown. 10.From the best-fit line, determine the acceleration of the rocket during this time interval? What quantity from this line allows you to determine the acceleration? Explain the mathematics and physics which allows you to do this. 1. Can an object have a velocity with zero acceleration? Can an object have an acceleration but zero velocity? Explain why or why not. 2. An object moving to the right has a positive acceleration which is decreasing. Is this object speeding up or slowing down? Explain why. Give a full description of the motion until the acceleration reaches 0 m/s2.
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