I enjoyed technology. All of the activities were entertaining, and the nearpods were informative. My favorite unit was electricity because I love learning about atoms and the periodic table. I also enjoyed using fab maker, and will continue to use it in the future. Lastly, building a better beam project and using trusses were extremely enjoyable. This is because I loved editing and making something better than it was before. Overall, I enjoyed technology and am excited to have another technology class next year.
This week I made an Electroscope. First I took a clear glass cup and a piece of cardboard. I cut the cardboard into a circle that was the same size as the cup. Next I cut a line into the middle of the cardboard circle. Then I made two tear dropped shaped pieces of tin foil and bent a paperclip so that all but the bottom curve was straight. After that I put the tinfoil tear drops on the curve and I slid this whole unit into the cutted cardboard. I taped the cardboard to the opened part of the cup so that it represented a lid. Next I blew up a balloon and rubbed it against felt. Finally I put the balloon on the paper clip. This resulted in the tin foil moving. The tin foil moved because the paperclip conducted the balloon’s energy.
Batteries do many things, and without them things like phones would not exist. But how were batteries created? Well, there were two scientists named Galvani and Volta. In the 1780s Galavani put a metal utensil over a frog’s leg, which made the leg move. This was called animal electricity, and Galavani believed that energy was stored in life forms. However, Volta thought it was the metal that caused the frog’s leg to move. To prove his theory, Volta set up stacked Zinc and Copper. In between every set of zinc pieces and one copper piece, he inserted a piece cloth that was soaked in salt water. What ended up happening was oxidation and reduction. The Zinc oxidized, or realised electrons. These electrons went through the copper and in reduction were added to the salt water. You can hook a light bulb up to the oxidation and reduction flow you will get electricity. After this the salt wat was replaced by a dry chemical paste. One battery has only so much metal, and once most of it has oxidized the battery will die. Rechargeable batteries like phones reverse the process so that the battery can work again. Over, time the system causes problems in the metal which makes the process impossible. In conclusion, batteries are important have evolved over time.
An atom is a tiny unit of a chemical substance. Everything is made up of atoms, including yourself. But what are atoms made of? Atoms are made up of Protons, Neutrons, and Electrons. Protons have positive energy, Electrons have negative energy, and Neutrons have Neutral energy. In an atom there is also something called the nucleus. The nucleus keeps the atom stable. The different amounts of Protons, Neutrons and Electrons in an atom are what decides what element they are. For example in copper there are 29 electrons, 29 protons, and 35 neutrons. Additionally, atoms are very small. If an atom was the size of a blueberry, and we wanted to see how many atoms there were in a grapefruit, then the grapefruit would have to be just as big as the Earth to fit all those blueberries.
This week we learned about nets. These are layed-out shapes that fold into a 3 dimensional shape. For example, many squares put together in a certain way can create a cube. I used a website called fabmaker studio to make different shapes out of nets. I made a bird and a cube. This was a fun and interesting way to look at three D figures and shapes.
This week we learned about levers. There are three different types of levers, 1rst class, 2nd class, and 3rd class levers. The first class levers are made for force or distance and can change direction. For this lever, the fulcrum is in the middle, the load is on one side and the effort is on the other. A good example of this would be a seesaw. The base that holds the seesaw becomes the fulcrum, the end of the board where the child sits on is the load and the other end where the adult pushes down constitutes the effort. Other examples of this would be wheels, door handles and bike brakes.
The second class of lever has the load in the middle and the force and fulcrum on the other end. A good example of this would be a wheelbarrow. The farmer pushing down on the handles is the effort, the wheel is the fulcrum and the stuff in the wheelbarrows the load. Other examples would be bottle openers, nutcrackers and nail clippers.
The third class of levers magnify movement. They have the effort in the middle, while the fulcrum and load are on the other end. An example of this would be a fishing pole. The person holding the rod would be the fulcrum, the arm pulling the rod would be the effort, and the fish would be the load. Other examples are brooms, pencils and canoe paddles. Overall, there are three classes of levers that all have interesting features.
This week we had a project about cubes and shapes. We had to make a cube out of toothpicks or paper and then see how much it could hold. Then we made and edited a second cube so that it would hold more than the first cube.
Making the cube was pretty simple. First I rolled up 4 pieces of paper and taped them together so that they formed a square. I repeated this step and then connected the squares by taping rolls of paper vertically from a vertex of one square to a of the other square. I did this four times that all the vertices were connected. Next I tested the cube. It was able to hold a book called Small Great Things by Jodi Picoult. Then I made another cube but added things based off of how the first cube fell. I added diagonal bracing on two of the sides and added a roll of paper that was vertical and ran from the edge of one square to the edge of the other square on the other two sides. This cube was able to hold The Dog Encyclopedia. I would have added the author, but the book only said “DK” at the top.
My results are very good, and I am proud of them. The dog encyclopedia weighs a lot more the Small Great Things. However, Small Great Things is still a big book. I could have made the cube even better if I used X bracing on all of the sides.
This week I created and tested different bridges. First I made a simple beam. I cut out six strips of cardboard and glued them together so they were stacked on top of each other. Next I made an I Beam. This was made from two strips of cardboard. I blended these strips so that there was a base and two sides. Then I glued these two bases together with a glue stick. This created an I shape.
To test these beams, I put them between chairs and made sure that the beams were not supported too much. Then I put weights on each beam. The simple beam was able to hold 12 lbs. However the I Beam was only able to hold 3 lbs so I edited it. I added small pieces of cardboard to the sides of the I beam to give it more strength. After this, the I Beam was able to hold 6 lb.
I was very surprised by my results and expected the I Beam to do better. I think this happened because of the materials that I used or the fact that the beams were small. It is also possible that the glue was not fully dried when I tested the I Beam.
There are many different types of forces that act on structures. The main ones are, Compression, Tention, Bending, Torsion and Shear. Compression is the action or state of being squished down or pressed together. Tension is the state of being tightly stretched. Bending is when a structure shapes into a curve. Torsion is the act of being twisted. Shear is a strain in the structure produced by pressure, when its layers are laterally shifted.
Different materials do better with different types of force. For example, concrete can withstand compression, but not tension. While blocks of wood can withstand tension and will break when compression is applied to it.
During the weekend I used and transferred energy. For example, I used Mechanical Energy to walk my dog. I also used Mechanical Energy, by striking a match for the fireplace. The Mechanical Energy was transferred to Thermal Energy. These were all examples of Kinetic energy. However, I also used Elastic Energy, which is a form of Potential Energy, when I stretch a rubber band.