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:
Answer: v0=10cm/s, vf=20m/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:
Answer: a=10cm/s/s, dt=3sec, vf=50cm/s.
• A ball travels 30 cm along an incline, starting from rest, while accelerating at 20 cm/s^2.
answer/question/discussion:
Answer: a=20cm/s/s, ds=30cm, v0=0cm/s.
Then for each situation answer the following:
• Is it possible from this information to directly determine vAve?
answer/question/discussion:
Answer: 1st situation: yes, vAve = (v0+vf)/2. 2nd situation: no we couldn’t solve it directly, it would take at least two eqns. 3rd situation: It would take more than one step.
• Is it possible to directly determine `dv?
answer/question/discussion:
Answer: 1st situation: yes, vf-v0 = dv. 2nd situation: yes, dv=a*dt. 3rd situation: no it would take more than one step.
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15 minutes
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