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: ->->->->->->->->->->->-> :
You have v0 = 10cm/s, vf = 20cm/s, and 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: ->->->->->->->->->->->-> :
You have a = 10cm/s^2, dt = 3 seconds, and vf = 50cm/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: ->->->->->->->->->->->-> :
You are given ds = 30cm, v0 = 0cm/s, and a = 20cm/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 situation 1: you add v0 and vf and then divide by 2 to get vAve.
For situation 2: you do not have a way to directly calculate vAve; you have to calculate the initial velocity.
For situation 3: there is no way to calculate vAve directly; you need to find the time interval first.
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• Is it possible to directly determine `dv?
answer/question/discussion: ->->->->->->->->->->->-> :
For situation 1: you subtract v0 from vf to get dv.
For situation 2: you multiply the acceleration by the time interval.
For situation 3: there is no way to calculate dv directly; you have to get dt first.
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20 minutes
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Solution
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