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PHY 231
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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 is 10 cm/s
vf is 20 cm/s
‘ds is 45 cm
The vAve can be found directly
‘dv can be found directly
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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 is 10 cm/s^2
‘dt is 3 seconds
Vf is 50 cm/s
The vAve cannot be found directly.
‘dv can be found directly
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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 is 30 cm
A is 20 cm/s^2
V0 is 0 since it starts at rest
The vAve cannot be found directly.
The ‘dv cannot be found directly
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Then for each situation answer the following:
• Is it possible from this information to directly determine vAve?
answer/question/discussion: ->->->->->->->->->->->-> :
I put the answer in each of the questions above
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• Is it possible to directly determine `dv?
answer/question/discussion: ->->->->->->->->->->->-> :
I put the answer in each of the questions above
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15 min
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