Phy 201
Your 'cq_1_6.1' 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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For each situation state which of the five quantities v0, vf, `ds, `dt and a are given, and give the value of each.
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A ball accelerates uniformly from 10 cm/s to 20 cm/s while traveling 45 cm.
answer/question/discussion: vo = 10 cm/s, vf = 20 cm/s, 'ds = 45 cm
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A ball accelerates uniformly at 10 cm/s^2 for 3 seconds, and at the end of this interval is moving at 50 cm/s.
answer/question/discussion: a = 10 cm/s^2, 'dt = 3 s, vf = 50 cm/s
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A ball travels 30 cm along an incline, starting from rest, while accelerating at 20 cm/s^2.
answer/question/discussion: 'ds = rest (0) & 30 cm, a = 20 cm/s^2
There can be only one displacement `ds on an interval. There are two positions, which could be expressed as 0 and 30 cm, but only one displacement, which is 30 cm.
The ball starts from rest so v0 = 0.
Then for each situation answer the following:
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Is it possible from this information to directly determine vAve?
answer/question/discussion: yes, (vf - vo) / 'dt
(vf - v0) / `dt is an important quantity, namely the rate of change of velocity with respect to clock time, but it is not vAve.
vAve is the average rate of change of position with respect to clock time.
Note also that vf and v0 are not both given in every situation. Unless they are either given or can be reasoned out directly in a situation, you can't use them in that situation.
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Is it possible to directly determine `dv?
answer/question/discussion: yes, vf - vo
There are three different situations, and your answers about the possibility of directly reasoning the quantities will be different for different situations.
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6 minutes
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You correctly identified almost all of the variables, but had some errors on the second half of the question.
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