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Phy 201
Your 'cq_1_07.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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A ball falls freely from rest at a height of 2 meters. Observations indicate that the ball reaches the ground in .64 seconds.
• Based on this information what is its acceleration?
answer/question/discussion: ->->->->->->->->->->->-> :
The ball travels 2 meters in .64 seconds. Therefore, the ball’s acceleration is 3.13 m/sec.
@& That is the correct average velocity.
But it's not the average acceleration.*@
(2meters) / (0.64 seconds) = 3.13 m/s
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• Is this consistent with an observation which concludes that a ball dropped from a height of 5 meters reaches the ground in 1.05 seconds?
answer/question/discussion: ->->->->->->->->->->->-> :
The balls are not traveling with the same acceleration.
If a ball is traveling 5 meters in 1.05 sec, then its acceleration is 4.76 m/sec.
(5 meters) / (1.05 seconds) = 4.76 m/s
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• Are these observations consistent with the accepted value of the acceleration of gravity, which is 9.8 m / s^2?
answer/question/discussion: ->->->->->->->->->->->-> :
The acceleration of gravity is 9.81 m/s/s
For the first ball, if acceleration of gravity is 9.81 m/s/s and it travels 0.64seconds, then it’s calculated distance traveled is 2 meters. So, yes this is consistent.
`ds = 1/2 g * `dt^2
`ds = 1/2(9.81m/s/s) * (.64s)^2
`ds = 2 meters
For the second ball, if acceleration of gravity is 9.81 m/s/s and it travels 1.05 seconds, then its calculated distance is 5 meters.
`ds = 1/2 g * `dt
`ds = 1/2 (9.81 m/s/s) * (1.05)^2
`ds = 5.4 meters
No, this is not consistent.
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*#&!
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&#See any notes I might have inserted into your document, and before looking at the link below see if you can modify your solutions. If there are no notes, this does not mean that your solution is completely correct.
Then please compare your old and new solutions with the expanded discussion at the link
Solution
Self-critique your solutions, if this is necessary, according to the usual criteria. Insert any revisions, questions, etc. into a copy of this posted document. Mark any insertions with &&&& so they can be easily identified.If your solution is completely consistent with the given solution, you need do nothing further with this problem. &#
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