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Phy 201
Your 'cq_1_04.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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The problem:
A ball is moving at 10 cm/s when clock time is 4 seconds, and at 40 cm/s when clock time is 9 seconds.
• Sketch a v vs. t graph and represent these two events by the points (4 sec, 10 cm/s) and (9 s, 40 cm/s).
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
I have placed the two points on my graph. Time in seconds is my x and velocity is my y. The first point of (4 sec, 10 cm/s) is much lower on the graph than the second point of (9 s, 40 cm/s).
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• Sketch a straight line segment between these points.
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
I placed a straight line between the two points on my graph. The line segment is sloping upward, meaning the coordinates are increasing.
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• What are the rise, run and slope of this segment?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
Rise = y2-y1
= 40 cm/s - 10 cm/s
= 30 cm/s
Run= x2-x1
9s - 4 s
= 5 s
Slope = rise/run
= (30 m/s) / 5 s
= 6
@& This quotient has units, which follow from the units of the preceding line. Be sure you understand why the units will be m/s^2.*@
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• What is the area of the graph beneath this segment?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
The area of the graph beneath the segment would be 6 cm. This is the average velocity as well.
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@& The region beneath the graph is a trapezoid.
What is the average 'graph altitude' of your trapezoid?
What is its width?
What therefore is its area?*@
*#&!*#&!
@& You need to revise your work on the area. Also check my note on the units of your slope calculation, which was otherwise correct.
Don't spend more than 15 minutes on the revision. If you don't get it by then, tell me what you do and do not understand about the area questions, according to the instructions below.
&#Please see my notes and, unless my notes indicate that revision is optional, submit a copy of this document with revisions and/or questions, and mark your insertions with &&&& (please mark each insertion at the beginning and at the end).
Be sure to include the entire document, including my notes.
If my notes indicate that revision is optional, use your own judgement as to whether a revision will benefit you. &#
*@