STEM experiments

Recently in our STEM class, Mr. Walach and Mr. Schlosser had informed the whole class on doing two different experiments. One experiment focusing most on the conservation of mass and volumetric flow rate, and the other focusing most on water weight and head height.

In the first experiment, experiment 1, we had to measure the speed water exits a hose and how it changes based on the diameter of the input hose and output hose. The formula for speed based on height is;

v=x2hg

where v = velocity of the fluid, x = horizontal distance traveled,
h = height of fluid above ground, g = gravitational constant (-9.8m/s2)

In the second experiment, experiment 2, we had to determine fluid flow rates at the bottom of a system due to gravity. The formula for speed based on height is;

v=x2hg

where v = velocity of the fluid, x = horizontal distance traveled, 

h = height of fluid above ground, g = gravitational constant (-9.8m/s2)

While doing these experiments, I came across many positives but also negatives. During my first experiment I had worked with a group of people I wasn’t so familiar with. During my second experiment I had worked with a group of people I did know, some of my friends. What was most interesting was that the experiment that I had done with the people I knew, had the best results. I think this might be because we were more focused and determined to get the work. But of course, with a little bit of fun.

Here is one photo of my experiment 2 group and I finding the distance of which the water lands:

IMG_4012.JPG

When we designed our experiment we created a hose that had about 3”8 in diameter, while the tube was 65 centimeters. We varied the height of the tube to see what will change while measuring the distance of the water that hit of the bottom of the bucket. The constant of this experiment was the height in which the fluid had exited. And the height had constantly changed.

As we did this experiment by measuring the distance, we collected an extensive amount of data. We wrote down the initial starting height (cm) which changed frequently, height from ground (cm), and lastly, the distance water flows (cm).

 

 

Here is some of the data we gathered:

 

Initial starting height [cm] Height from ground [cm] Distance water flows [cm]
Test 1: 95

Test 2: 95

Test 3: 95

35

35

35

56

52

57

Test 1: 90

Test 2: 90

Test 3: 90

35

35

35

45 cm

48 cm

50 cm

Test 1: 85

Test 2: 85

Test 3: 85

35

35

35

49 cm

49cm

47cm

Test 1:80

Test 2:80

Test 3: 80

35

35

35

36 cm

38 cm

40 cm

During and after, we did these two experiments we learned about velocity and distance. Velocity is the speed of something in a given direction. Distance is a scalar (having only magnitude, not direction) quantity that refers to “how much ground an object has covered” during its motion.

We also not only learned more about different physics terms and about experimenting different trials, but we learned more about how to create these experiments on our own and solve problems on our own. Within these two first experiments that we have done this year, we were very self directed and had to make sure we motivated ourselves to get the work done. We also had to not only solve problems on our own but we were able to talk them out with our group members, if we were stuck on something.

I really enjoyed these experiments that we did in STEM and I really hope we do more of these in the future. And hopefully, if they involve water again, I’ll get more water into the bucket than on the floor.

 

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