PHY 201
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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
'ds = 45 vm
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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: ->->->->->->->->->->->-> :
For the first situation you can determine vAve directly by (vf + v0) /2.
For the second situation you can determine vAve directly, but you will have to calculate v0 first from the equation a = 'dv / 'dt = (vf - v0) / 'dt. After you obtain v0 then you can calculate vAve.
For the third situation you can't determine vAve directly.
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• Is it possible to directly determine `dv?
answer/question/discussion: ->->->->->->->->->->->-> :
For the first situation you can determine 'dv directly by vf -v0.
For the second situation you can determine 'dv directly by the equation 'dv = a * 'dt.
For the third situation you can't determine 'dv directly.
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30 min
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