Today we finished our 2nd rocket design. There was some disagreement between us when we argued to decide which bottle to use, the short stubby one, or the long one we used last time. I voted for the long one since, 1, we were the highest with that bottle so I thought we should use it, 2, the nose cone did not fit onto the short one anyway. Then we glued the new wings on (they weren’t really new since we just traced the old wing shape onto the cardboard) and I beautifully glued the nose cone on. Jackpot!
Today we launched our rockets. It was really fun since I got to actually set up the rocket on the launchpad for our group. It was pretty simple; since all, you needed to do was:
1 – Put the rocket filled with 200 ml of water on the rubber stopper. 2 – Secure the rocket by setting two flat metal bars above the plastic ring below the cap, then screwing them in place. 3 – Attach a bike pump to the cord connected to the stopper, pump to 90 psi, then pull the rope (but not without a proper countdown, of course)
The rocket should blast off in the air.
Our rocket group, J.E.X.L (the letters of our first names)’s rocket went 56.5 meters in the air. Here is how we found the exact measurement:
First, when we launched, a group of Clinometer Readers and Data Recorders were set 50 m of either side of the launchpad. The Clinometer Readers used clinometers (obviously) to measure the height of a stationary/moving object. When you point it at the height of the object, gravity points the arrow down at the measurements etched at the bottom, similar to a protractor. Also, there is a trigger that releases the arrow and keeps it in place. There are two people at each point, so there is an Angle 1 A and B, along with angle 2. The averages for both of them for our group were 45° and 53°. We drew a graph and aligned it with the meter chart next to it. But you are not done, you need to add the height average to the total, 1.5. I got 55, so 55m +1.5m =56.5!
The building of our rocket was tough since we went through a lot of mistakes. First, we mixed bottles, so we glued one of the cardboard wings before realized. Next, we mixed tapes, so our rocket was red when we wanted it to be pink. Finally, I did wrong measurements on the nose cone, so the 3d printed thing was 2-3 times bigger than our rocket. It was hard.
The type of science we are learning in physics. The first thing we did was study Isaac Newton and his laws in these booklets. The First law states that every object persists in its state of rest or uniform motion in a straight line unless it is compelled to change that state by forces impressed upon it. An example of this is when there is a stationary soccer ball that you kicked, the power of your foot is the outside force. The Second law states force equal to the change in momentum (mV) per change in time. For a constant mass, force equals mass times acceleration. For example, a car accelerates faster than a truck because the car has less mass. The third law states that for every action, there is an equal and opposite reaction. An example of this is when you paddle a canoe, your force from the paddle pushes the water back, while it pushes you forward.
When we launched, our rocket got totally wrecked. When it landed, (since we were the highest, the rocket landed with more force, the bottle got totally crinkled up and one of the fins got loose. But before I mentioned we had a bigger nose cone, so a friend printed it on his 3d printer over the weekend. Around 30 minutes before the launch, we glued on the nose cone, and I was worried that it would come off. But when we checked it after the launch, it was perfectly stable.
My questions are:
How can we improve the rocket so it will have higher goals next time?
How can we compare this to real rocket launches?
Here are some media:
Gol is a cow, but Katherine Applegate (author of Home of The Brave) also uses her as a symbol. How does Gol represent Kek’s past, present, and possibly his future?
Gol represents his past because Kek used to be a cow herder, they moved according to the sun. Gol can represent Kek’s present because Gol is old and weary like Kek feels. He feels old because he is only a child, to have gone through so much. Kek feels weary because of his travels. And Gol is alone, like Kek. He feels like he doesn’t belong, like the cow in the winter. Kek wanting to run away is similar to that. Gol represents his future because she is going into a new world, like Kek and his mom
Today we got our 3d printed nose cones… Our groups was a fail. It was all my fault since I didn’t look at the measurements of the cone in the program. I am very guilty. The nosecone was supposed to be 3-2 inches.
Look at this monstrosity:
I learned that successful people fail a lot of times to get to the top. Now the measurements are okay and a classmate is printing it for me.
Today we learned to used tools to practice when we measure how far/high our rockets go. The tools that we used are called a Clinometer, for height, and a Trundle Wheel for length. The clinometer measures heights when you point it up and release the trigger, then the gravity pulls the arrow down, making the arrow point at the exact angle marked below. But it differs the angle on how far away from the thing you’re measuring. There’s an illusion, where when you back away from something, it seems to get smaller, then you point the tool lower, and it is not as high. For example, at 17 ft away from a flagpole, it is 40 degrees, but at 10 ft, it is 80 degrees.
The modern trundle wheel is pretty simple when you roll the circle at the end of the stick, it clicks every time you reach a meter. The old ones you have to look at the measurements on the face of the circle and stop every time you reach a meter.
Today we made our rockets! First, we cut out cardboard wings and measured them. Next, we wrapped them in duct tape that was very colorful. We used sandpaper to roughen up the bottles so it would be easier to glue on the wings. I had a chopstick for a needle and I sanded nice and clean. We have our 3d design for our nosecone and it will be awesome!
This year we have done rocketry! When my teacher first said it, I was very optimistic about it. Then we got shuffled and put in groups. We named our group J.E.X.L after the first letter in each of our names. We thought that it would be a sort of N.A.S.A. sort of thing. Then for homework, we had to bring in ideas and pictures for the inspiration board. It was really fun when we printed out pictures of different rockets and rocket launches. Also for homework, we got to study Isaac Newton and his laws of motion to help us better understand the physics behind the rockets. Then we glued and designed our Inspiration Boards. It looked nice with the frilly cuts and the different colors. But the important part was that it inspired us on what to do when building and launching. Now, we are bringing in materials to build them and I am in charge of cardboard. It will be so fun to launch!