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PHY 121
Your 'cq_1_06.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** CQ_1_06.1_labelMessages **
For each situation state which of the five quantities v0, vf, `ds, `dt and a are given,
and give the value of each.
A ball accelerates uniformly from 10 cm/s to 20 cm/s while traveling 45 cm.
answer/question/discussion: ->->->->->->->->->->->-> :
v0=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 seconds
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=30 cm
v0=0 cm/s
a = 20 cm/s^2
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Then for each situation answer the following:
Is it possible from this information to directly determine vAve?
answer/question/discussion: ->->->->->->->->->->->-> :
In order to find this directly, you need the v0 and vf to add together and divide by 2.
Question 1: (10 cm/s + 20 cm/s)/2 = 30 cm/s / 2 = 15 cm/s
Question 2: You have the final velocity but not the initial velocity.
Question 3: You have the initial velocity but not the final velocity.
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Is it possible to directly determine `dv?
answer/question/discussion: ->->->->->->->->->->->-> :
Question 1: In order to find the `dv, you need to subtract the initial velocity from
the final velocity. 20 cm/s - 10 cm/s = 10 cm/s
Question 2: You can find the change in velocity by multiplying the acceleration by the
time, so 10 cm/s^s * 3 s = 30 cm/s change in velocity.
Question 3: You cannot find the change in velocity from the information given. You
would have to do other calculations first.
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*#&!
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