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Phy 121
Your 'cq_1_13.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** **
A ball rolls off the end of an incline with a vertical velocity of 20 cm/s downward, and a horizontal velocity of 80 cm/s. The ball falls freely to the floor 120 cm below.
For the interval between the end of the ramp and the floor, hat are the ball's initial velocity, displacement and acceleration in the vertical direction?
a = 9.8cm/s^2 ds = 120cm vo = 0cm/s
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What therefore are its final velocity, displacement, change in velocity and average velocity in the vertical direction?
vf = 20cm/s, ds = 120cm, change in velocity is 20cm/s, average velocity = 10cm/s^2
#$&*
@& The ball starts with a downward vertical velocity of 20 cm/s.
You aren't told what its final vertical velocity would be.*@
What are the ball's acceleration and initial velocity in the horizontal direction, and what is the change in clock time, during this interval?
a = 9.8cm/s^2, vo = 0cm/s, I dont know the change in clock times because it does not state a time in the question.
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@& You know vertical displacement, initial vertical velocity and vertical acceleration. You can use the equations to find the remaining quantities for the vertical motion.*@
What therefore are its displacement, final velocity, average velocity and change in velocity in the horizontal direction during this interval?
ds= 120cm, 80cm/s = vf, 40cm/s^2 = average velocity, 80cm/s = change in velocity
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@& During the fall the ball's horizontal velocity doesn't change. After it strikes the floor that velocity will very likely change, but at first contact with the floor its free fall is over.*@
After the instant of impact with the floor, can we expect that the ball will be uniformly accelerated?
No
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Why does this analysis stop at the instant of impact with the floor?
Because the ball does not keep moving after it hits the floor.
#$&*
*#&!
@&
&#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. &#
*@
#$&*
Phy 121
Your 'cq_1_13.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** **
A ball rolls off the end of an incline with a vertical velocity of 20 cm/s downward, and a horizontal velocity of 80 cm/s. The ball falls freely to the floor 120 cm below.
For the interval between the end of the ramp and the floor, hat are the ball's initial velocity, displacement and acceleration in the vertical direction?
a = 9.8cm/s^2 ds = 120cm vo = 0cm/s
#$&*
What therefore are its final velocity, displacement, change in velocity and average velocity in the vertical direction?
vf = 20cm/s, ds = 120cm, change in velocity is 20cm/s, average velocity = 10cm/s^2
#$&*
@& The ball starts with a downward vertical velocity of 20 cm/s.
You aren't told what its final vertical velocity would be.*@
What are the ball's acceleration and initial velocity in the horizontal direction, and what is the change in clock time, during this interval?
a = 9.8cm/s^2, vo = 0cm/s, I dont know the change in clock times because it does not state a time in the question.
#$&*
@& You know vertical displacement, initial vertical velocity and vertical acceleration. You can use the equations to find the remaining quantities for the vertical motion.*@
What therefore are its displacement, final velocity, average velocity and change in velocity in the horizontal direction during this interval?
ds= 120cm, 80cm/s = vf, 40cm/s^2 = average velocity, 80cm/s = change in velocity
#$&*
@& During the fall the ball's horizontal velocity doesn't change. After it strikes the floor that velocity will very likely change, but at first contact with the floor its free fall is over.*@
After the instant of impact with the floor, can we expect that the ball will be uniformly accelerated?
No
#$&*
Why does this analysis stop at the instant of impact with the floor?
Because the ball does not keep moving after it hits the floor.
#$&*
*#&!
@&
&#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. &#
*@