Your work on flow experiment has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
Your initial message (if any):
This is a resubmission as the original has not shown up in my folder.
Is flow rate increasing, decreasing, etc.?
The rate of flow would decrease.
Is the velocity of the water surface increasing, decreasing, etc.?
I would expect the velocity to remain the same.
How would the velocity of the water surface, the velocity of the exiting water, the diameter of the cylinder and the diameter of the hole be interrelated?
The amount of pressure helps to determine the flow rate. THe diameter of the cylinder determines the amount of water it can hold. The size of hte hole would determine the rate that the water can exit and the cross-sectional area and therefore help determine its velocity. The velocity of the water surface is proportionally related to the velocity of the exiting water.
Explain how we know that a change in velocity implies the action of a force:
The velocty has increased because the acceleration as increased. Force is equal to Mass* acceleration. Therefore the change in velocity can be used to find the acceleration and then the force.
Does the depth seem to be changing at a regular rate, at a faster and faster rate, or at a slower and slower rate
The depth is changing at a slower and slower rate. Each interval is about half the one before it.
What do you think a graph of depth vs. time would look like?
The graph would slope because as the time increases, the depth is decreasing.
Does the horizontal distance (the distance to the right, ignoring the up and down distance) traveled by the stream increase or decrease as time goes on?
THe horizontal distance woulddecrease as the amount of water decreases and there is less pressure.
Does this distance change at an increasing, decreasing or steady rate?
THe distance changes at a decreasing rate.
What do you think a graph of this horizontal distance vs. time would look like?
The graph would a gentle sloping line that is gradually increasing.
The contents of TIMER program as you submitted them:
1 11.04688
2 13.32813 2.28125
3 15.25 1.921875
4 17.21875 1.96875
5 19.4375 2.21875
6 21.60938 2.171875
7 24.26563 2.65625
8 26.90625 2.640625
9 30 3.09375
10 33.57813 3.578125
11 38.32813 4.75
12 44.9375 6.609375
13 50.85938 5.921875
The vertical positions of the large marks as you reported them, relative to the center of the outflow hole
0cm
1.3cm
3.3cm
5.2cm
7.1cm
9.0cm
10.9cm
12.8cm
14.6cm
16.5cm
18.3cm
20.1cm
22cm
Your table for depth (in cm) vs clock time (in seconds)
0,22
2.28,20.1
4.20,18.3
6.17,16.5
8.39,14.6
10.56,12.8
13.22,10.9
15.86,9.0
18.95,7.1
22.53,5.2
27.28,3.2
33.89,1.2
39.81,0
Is the depth changing at a regular rate, at a faster and faster rate, or at a slower and slower rate?
My data does supprt my answer above. The depth is changing at a slower and slower rate.
Your description of your depth vs. t graph:
The line is decreasing at an increasing rate. As the depth decreased, it took more time.
Your explanation and list of average average velocities:
I subtracted the second distance from the first to find the change in distance. I then divided it by the time interval between those two numbers. I continued with subtracting the third number from the second and divided by the time interval between them. I continued this with all the numbers.
.833
.937
.914
.856
.829
.715
.720
.614
.531
.421
.303
.203
The midpoints of your time intervals and how you obtained them:
1.14
3.24
5.18
7.28
9.75
11.89
14.54
17.41
20.74
24.91
30.58
36.85
I divided the interval by 2 and added it to the first number. THen I took the second number, divided by 2, and added it to the second number. I continued with each interval.
Your table of average velocity of water surface vs. clock time:
1.14,.833
3.24,.937
5.18,.914
7.28,.856
9.75,.829
11.89,.715
14.54,.720
17.41,.614
20.74,.531
24.91,.421
30.58,.303
36.85,.203
Your description of your graph of average velocity vs clock time:
The graph is a sloping line that is decreasing at a increasing rate. The points for the most part are becoming further apart as the time went on.
Your explanation of how acceleration values were obtained:
.3650
.0540
-.0113
-.0261
-.0127
-.0427
.0016
-.0341
-.0232
-.0231
-.0179
-.0169
acceleration is change in velocity / change in time. I took the first velocity and subtracted it from the second. I then divided it by the change in time which I found by subtracting the first time from the second. I continuted on to the third velocity and subtracted the second from it. then divided it by the change in time of the 2nd and 3rd numbers. I continued on with all of them.
Your acceleration vs clock time table:
1.14, .3650
3.24, .0540
5.18,-.0113
7.28,-.0261
9.75,-.0127
11.89,-.0427
14.54, .0016
17.41,-.0341
20.74,-.0232
24.91,-.0231
30.58,-.0179
36.85,-.0169
According to the evidence here, is acceleration increasing, decreasing, staying the same or is in not possible to tell?
My results suggest that the acceleration of the water surface is decreasing. I did however, have a few cases where the acceleration reversed for one point and then when back to the pattern.
I beleive that the acceleration is actually decreasing.
This looks very good, with excellent data and analysis.
Your report has been received. We will be discussing this work as a group, after the due date.