PHY 121
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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.
• 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
‘dv = 10 cm/s
‘ds = 45 cm
vAve = 15 cm/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
vf = 50 cm/s
‘dt = 3 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 cm/s
a = 20 cm/s^2
Then for each situation answer the following:
• Is it possible from this information to directly determine vAve?
•
answer/question/discussion: ->->->->->->->->->->->-> :
For the first question, yes you can directly determine the vAve. However, in the next two questions you have to do a little more figuring inorder to get to the vAve.
• Is it possible to directly determine `dv?
answer/question/discussion: ->->->->->->->->->->->-> :
Again, for the first question ‘dv is directly determined, however, again a little more figuring will have to be done in order to determine the vAve.
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30 minutes
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Well done.