# Made up a stupid experiment for physics... help me save my grade!

<p>We have a "Group 4" project for physics were we make up a question to research and test. We did our testing but when it came to writing our conclusion I realized that my whole question/experiment is screwed up! If you could help me save this in any way possible, I would truly appreciate it. All I did this saturday was research and I am extremely frustrated... </p>

<p>Question:
To quantitatively and qualitatively describe the relationship between the material of an athletic material and the internal pressure at which such athletic material ruptures. </p>

<p>So basically we "blew up" a basketball and kickblal. All the other stuff wouldn't even blow up. The psi's were 79 and 33 respectively. I am trying to find an equation that relates to the material and the pressure at which it blows up, but I am beginning to realize it doesn't even depend on the material... </p>

<p>I was thinking about using Young's modulus?</p>

<p>Please please help me.. I don't get what I am doing! It is extremely frustrating, as it is an internal assesment for IB and a test grade. I know I am a dumbass for coming up with this question... but I can't change it...</p>

<p>has your previous parts been marked?</p>

<p>sounds like you are still doing the analyzing part. Are the 79 and 33 the only data you took?</p>

<p>PS, is this your physics IA or group 4 project?</p>

<p>here is the planning and b data.. hopefully you can help me figure something out?? i know i am reallyy stupid with this project.. idk what the heck i am doing.. it is the group 4 project (isn't it also an internal assesment??)</p>

<p>Problem
To quantitatively and qualitatively describe the relationship between the material of an athletic material and the internal pressure at which such athletic material ruptures. </p>

<p>Hypothesis
The pressure at which a material erupts is directly related to the strength of such material. This is because a ball erupts when the internal pressure force overwhelms the strength of the material making up the ball. </p>

<p>Variables
The independent variable is the material of the ball while the dependent variable is the pressure at which the ball deflates. The controllable variables include the altitude at which the experiment was performed and the diameter of the ball. </p>

<p>Procedure
1. Gather the following materials:
 Air Compressor
 Bricks
 Athletic test materials of the same diameter: 3 leather basketballs, 3 rubber kickballs, and 3 PVC/PU footballs.
 Goggles
 Thick Carpet
 Stool
 Duct tape
 Camera and a tripod stand
To ensure safety, remember to wear goggles when deflating the balls.
2. Select the materials for rupture  the basketball, the kickball, and the football. Ensure that the diameters (and thus areas) of the balls are equal.
3. Construct a barricade using the bricks. The base of the barrier should be a square with a side length of three bricks. Afterwards, make the barrier six bricks high, inserting the hose of the air compressor on the 4th layer so that the hose fits securely between two bricks. Place a stool under the air compressor/pump to ensure stability of the set up.
4. Completely deflate the nine balls that will be used for testing by placing one of the nine air needles into each ball and squeezing the middle of the ball.
5. Connect the needle of the air compressor to the kickball.
6. Secure the needle and air compressor with duct tape  wrapping the air needle and the head of the air compressor
7. Cover the barricade with carpet and place another layer of bricks on top of the carpet.
8. Plug in the compressor, set up and turn on a camera on a tripod stand that focuses on the gauge. This is to record the pressure at which the ball erupts without danger.
9. Turn on the compressor and step up at least ten feet away from such compressor. Wait for a loud sound, which will ensure the deflation of the athletic material.
10. Repeat steps 5  10 using the other two kickballs.
11. Repeat steps 5  10 three times using the basketball.
12. Repeat steps 5  10 three times using the football
13. Review the recordings of the tripod camera and record the pressure at which the materials erupted.
Data</p>

<p>Ball Material
Kickball Rubber
Football PVC/PU</p>

<p>Trial Kickball Pressure (psi) Football Pressure (psi) Basketball Pressure (psi)
1 79 103 32
2 76 108 35
3 81 116 31
Average 79 109 33</p>

<p>Sorry, I hate physics.</p>

<p>well to go along with you setup, and hypothesis, I suggest you do a little background research on the 3 materials and find some data you can use. and graph taht against the erruption pressure. from the data is recorded, it seemed that foot ball had the strongest materal. however I suggest you take out the anomalies in calculating your average, like 116 in the football readings is way above the other 2.</p>

<p>as for your planning B, there are ALOT more variables to control than these, although its quite hard to control all of them. since you are working with gases, temperature's important, although less significant. thickness of the material is a very important factor that could be the explaination of error in this expirnment. </p>

<p>neways, group 4 isn't that big of a deal, analysis marks are usually pretty easy to get even if your analysis doesnt make much sense. just make sure you include al lthe IB components (like errors in your data collection). and have fun with the project.</p>

<p>lynda, thank you so much for your help!</p>

<p>The G4 project doesnt really count much. Honestly, it's just a waste of time. Chill out, even if it doesnt end up really well, you wont be losing much. (My G4 was in physics and chem and I did some screwed up ****. Either way, I should be getting a 7 in both in the finals if I work hard enough)</p>

<p>You dont even need to include an equation. Just say that your hypothesis was incorrect and explain. You get marks for your analysis. If I remember correctly, it doesnt matter whether your hypothesis is corect or incorrect.</p>

<p>what if i relate max pressure to volume? technically, i could still get the volume of the balls since we have the exploded ones..</p>

<p>IB Board doesn't care too much about the results. Remember to show team work and follow IB guidelines (planning (a), planning (b), etc...) you'll do fine.</p>