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 = 10cm/s
vf = 20cm/s
`ds = 45cm
• 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 = 10cm/s^2
`dt = 3 seconds
Vf= 50cm/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 m/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: ->->->->->->->->->->->-> :
to determine vAve you must know the initial and final velocity. You can determine vAve in the first situation but in the other two final velocity is not known.
• Is it possible to directly determine `dv?
answer/question/discussion: ->->->->->->->->->->->-> :
to determine `dv we must know distance and time. We do not know these variables in all situations.
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15 minutes
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Good. Check the link to be sure you understand all the specifics; no revision should be required.
&#Please compare your solutions with the expanded discussion at the link
Solution
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