Phy 121
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Assign 6 Seed Question
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 s
• 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 =3s
vf = 50 cm/s
• 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 (starts from rest)
a = 20cm/s^2
Then for each situation answer the following:
• Is it possible from this information to directly determine vAve?
answer/question/discussion: ->->->->->->->->->->->-> :
Yes. We would need the values for v0 and vf since we have these and acceleration is uniform then we could use vAve = (vf+v0)/2 .
The answer to this question will be different for different situations.
• Is it possible to directly determine `dv?
answer/question/discussion: ->->->->->->->->->->->-> :
As long as we have 3 of the 5 quantities we can solve for vAve and ‘dv/
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30 minutes
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Good, but be sure to see the discussion below and let me know if you have questions. No revision is required.
&#Please compare your solutions with the expanded discussion at the link
Solution
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