Wheel and Axels

What are Wheel and Axels? Wheel and axels can be screwdrivers, doorknobs, etc. The wheel is bigger circle and axel is on the inside. The wheel and axel move synchronously together. A wheel and axel is also a force magnifier. To find radius of axel, measure from center to edge of axel. To measure the radius, go from the center of the axel to the edge of the wheel. A wheel and axel is actually a 360 degree lever.

Electricity

Did you know that the word “Electron” was first “Elektron”? An Elektron was actually amber. The person who thought of that was William Gilbert.

He called it that because when he rubbed the amber on dry cloth, it attracted small things. That was Static. For homework, we made an electroscope. We inflated a ballon and rubbed it on felt, cloth, or even our hair! To make the electroscope, I cut a cardboard circle to the shape of a glass and cut a line to the middle, straightened out a paper clip except for the hook in the middle, stuck into the line in the cardboard circle, and then I put two tinfoil teardrops onto the hook on the paperclip, and taped the cardboard onto the cup. Remember the ballon? After rubbing it on my hair, I put it up to the paperclip, but didn’t touch it to it. The two tinfoil teardrops spread apart from each other. The static from the ballon transferred through the paperclip to the tinfoil and made them move.

  I hope you enjoyed my blog!  🙂

 

 

Tech #2

We just worked on adhesives. Adhesives are things that stick. Like glue. Different adhesives have different specialties. Some dry faster, some stick better. But some glues are dangerous. Like e6000. e6000 can give you cancer. You always have to read the back of the glue for safety. But glues like Elmer’s glue are safe. Glues were not always like this though. The first glue was made from animal body parts. The Egyptians made something similar, but they boiled animal hides and horns. Then, people made glue out of old horses. Finally, Elmer’s was made. But not the Elmer’s that we know. Elmer’s back them was made of milk. That’s why the cow is the logo. Elmer’s is no longer made of milk, but they kept the logo. Then we made more glue brands.lots more. I had a lot of fun learning and writing about the subject. I can’t wait to keep going!

Tech

In tech, we have worked on elasticity and ductility. Elasticity means a material is stretchy, like taffy. If a material is ductile then it will stretch, but keep its strength. Some materials are also brittle, which means that it will break or snap instead of stretch. Diamond, wood, or cool glass is brittle. Steel and Hot glass are elastic, and copper and aluminum are ductile. These are just some things. To measure how much a material will stretch, people put a chart next to what they’re stretching and draw lines on the material to measure how much it stretched. I am having a lot of fun with this subject and am excited to keep going.