Today, January 8th 2009, we finished our lab which we started the day before. There were three labs we had started. One of them was called Wavy Motions. In this lab, we took a slinky and moved it in different directions to form different waves. Then we had to draw what we observed and answer some analyzing and concluding questions. Another lab we did was a Skills Activity, AKA Calculating. In this lab, we had to tie a string to a washer and then tape it to a table. After that, we would have to extend the washer on the string out to it's full extent and then let it go to sway back and forth. While it did this, we had to use a stop watch and time how long it takes for the string to make ten full rounds from it's starting point and back. The last step we made was to calculate the frequency by dividing the ten cycles by the time interval. The third lab we did was called Discover Activity, AKA Can You Change a Wave? During this lab, we had to lay a jump rope on the floor, then with a partner, we had to flick our wrists left and right forming waves. At first we had to start of with one flick per second, but then we had to go faster with two flicks per second. Later on, we had to answer questions. One interesting fact I learned was that in in the Wavy Motions lab, the more coils you released at a time, the more the slinky shook. Also, another interesting fact I learned was that in the Calculating lab, in order to find the frequency, you have to divide the speed by the wavelength. The last interesting fact I learned was that in the Can You Change a Wave activity, the faster I flicked the jump rope, the waves became smaller because of the rapid movement. One fact I found out online is that a pulse traveling through a string with fixed endpoints resembles a waves with crests and troughs. Another fact I learned is that wave motion is a type of harmonic motion that carries energy from one place to another without actually moving any matter. I believe this is a key topic to learn because without knowing how waves move, you won't know how some laws of physics work. For example, if you see a wave bobbing up and down in the water, without learning this you won't know how it's really doing that. All in all, those were the labs we did today, January 8th 2009, what I learned, some facts I found online, and how I feel about the topic.
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