First, we had a very simple, daily quiz on homework tasks previously assigned and the information covered in the blog. He showed us the correct way to post for points as well as how to make a scribe post. Also, we went over different ways to convert units using the metric system. Jojo showed us a brief explanation and a pictural representation of the relative unit sizes in relation to each other. We have also learned that the units from largest to smallest in the metric system are as follows: Kilometer, Meter, Centi, then Mili. 10 Milimeters make up one centimeter, 100 centimeters make up a meter, and 1000 meters make one Kilometer. Along the same lines, it takes 1000 milimeters to have 1 meter.
Furthermore, we have learned to convert from one unit system to the other using conversion factors such as 1in = 2.54cm. We also learned that when solving simple algebraic equations with all of the variables having the same units, the units then cancel out. We now know how units act.
Although we have other valuable resources such as a calculater or google, we must learn how to convert from one system of units to the other. One easy way to evaluate unit conversions is to be cognisant of the similarities between variables such as one apple = one apple, one orange = one orange and one foot = 12 inches. Using this system, we can properly covert units from one system to the other by properly crossing out the the waste variables and keeping the variables we need. For example, if you need to end up with an answer with the units of miles/hour and you start out with feet/second, you will have to multiply the feet/second by 3600seconds/1hour. That conversion will convert your feet/second into feet/hour. You then multiply your feet/hour by 1 mile/5280 feed and this will take care of your conversion from feet to miles. You end up with miles/hour after canceling out the seconds first and then the feet.
In order to notate an approximate answer, the symbol called the tilde (~), is used.
Length can be described without units if describing sections of length from one point to another. For example, AB = 5, BC = 10, so AB + BC = AC. Part of the line added to the remaining part's length, will equal the total length from A to C.
The next scribe is Cullen.
Monday, August 31, 2009
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