# Matthew's Blog

## Principles of Flight

Video 2017-05-19, 12 54 35 PM-qmu0xaCreate a definition in your own words (Bernoulb’s Principle). Find a diagram that explains your meaning

Bernoulb’s principle is a principle (or theory, I don’t know) that explains why certain objects can float or fly. In Bernoulb’s principle, you must have high velocity with low air pressure (actually, when ever you haave high velocity, you immediately have low air pressure). If it was reverse, then you would have low velocity with high air pressure. If you have high velocity with low air pressure, you can make things float. An example is a hair dryer and a ping-pong ball. If you put the ball on the hair dryer, by turing on the dryer, the air flow around the ball is high velocity with low air pressure. This will make the ball float in midair. Even if you tilt it, it should stay floating (for a little while).

Part 2:

Video 2017-05-04, 1 23 29 PM-2ajhgxk

## Do you want to be bright?

Question #1: Why are you doing it?

The reason why I am doing this is because I want to help people who don’t have things (ex: lights) that I use in my everyday life. I feel that it’s unfair that I can abuse the things that are common to me, but it is a luxury for others.

Question #2: What you have done?

The first picture is an example, so I didn’t do that one. However, my design is similar to the example. My design was basically a thermos, the light would go through the middle, the lid would be the switch and the bottom be the solar panel. The second picture is a step that we are doing to make a circuit board. We’ve started to “soldering” {sought-er-ing), so when we put lights in the circuit board, it dosen’t move while in its position or can’t be taken out. Its kinda like putting glue on a popsticle stick to another popsticle stick and putting them together.

Questions #3: what you have learned?

I have learned to “sought-er.” What “Sought-er-ing” is you have a wired metal string thing and you make contact with a “sought-er-ing iron.”  The metal string immediately turns to liquid because of how hot the iron is. It’s really fun and a little bit dangerous. Here are some pictures of “sough-ter-in”:

I have also learned about resistors. Have you ever wonder why LEDs run out so fast. Thats because there’s no resistors attached.  Because LEDs are sometimes are attached directly at the battery, its too much power to handle. If you attached the LED to the resistor instead (of course its attached to the battery as well, its just not directly attached), then it will resist most of the power so the LED lasts longer.

## Straw tower challenge

1. Describe the shape or construction of the tower that was the tallest and won the challenge? How was this tower different from yours, if yours did not win?

We had one huge tower, made by paper. Then we used straws and Rolled up paper to be the support beams. Then using the tape to actally hold the tower and the support beams.

2. If you had a chance to do this project again, what would your team have done differently?

Nothing really. My team won, though I guess i should have work a little more. I didn’t really do anything except hold the tower in place so my Group can put tape on.

3. Do you think that this activity was more rewarding to do as a team, or would you have preferred to work alone on it? Why?

Definitely as a team. It’s better to have 3 or 4 minds than one. Also we have different perspective about the tower, so if one thing looks okay to Jayson for example, Charles and David might think something else.

4. If you could have used one additional material (tape, glue, wood sticks, foil — as examples) which would you choose and why?

Wood sticks, i believe that the wood sticks could hold it better than straws. Also that the wood sticks don’t bend so, yeah.

5. Do you think that once a building is designed and approved for construction that many aspects are changed during the building process? Why or why not?

Yes, because you may think it’s a good idea, but once you go and build it may fall. Thats why people always change major or minor details about construction.

6. How long do you think it will take before a building is constructed that surpasses the height of the Burj Khalifa? Where do you think it will be built? Why?

Probably a couple of years, maybe 20-30 years. They would probably build it somewhere on flat ground. Because they would have to dig in if it was built on a hill. What I’m trying to say is that they would have to dig into the mountain to make it flat ground for the tower. Also that it takes even more time when digging into a hill because you have to get a drill, which takes awhile and money.

## Marshmallow challenge

1. Was there a leader on your team? Who was it and who decided who the leader would be?

Zach was the leader. He just took charge, we didn’t talk about it or he didn’t say “i am the leader” he just did it.

2. If you had no leader, do you think having designated someone a leader would have helped?

For the most part he was a good leader. He had good ideas and took some ideas. He included all of us to build and it work well until the end.

4. How helpful was everyone on your team in challenging the process of building the tallest structure? Did anyone appear to
be an expert?

NO one was an excpert. We just did it. Everyone was helpful

5. Did any team members tune out of the activity — out of frustration with other members or for some other reason? What could you have done to keep all members of the group fully
engaged?

We all participated

6. Did you feel everyone’s ideas were well received during the activity?

Yes

7. How did you feel as the time limit was approaching? Did pressure increase? If yes, was that helpful or not?

Not really, well I am competitive for the most part, but it didn’t really feel like a challenge. Felt more like a team project

8. In retrospect, what could you have done better?

Did you celebrate small wins? If yes, how did you do this?

No

## Blog post, Trig

I learned more about angles and how you can find certain angles through sin law or co sin law, and how soh-cah-toa only works on right angle triangle. I also learned more about the angle of depression and elevation.

1. Its a function that can be shown and describe through an equation of : f(x)=ax(squared)+bx+c

2a)

2b)

It looks like the two lines are parallel. When vertext is a minimal point,  the U slowly opens up. When Vertext is maximum, the u closes up

3a) its a maximum point, an upside down “U”

3b)Its a minimal point, higher the positive number, the less of the width in the “U” shape.

3c) Minimal point, the smaller the number in “a” the bigger the “U” gets

4. When “a” is positive, the vertex is the minimal point. When its negative, it turns into the maximum point.

5. The Minimal point changes when “b” # changes.

6.How high in the graph does the “U” go, the second point in the “u” shape is the Y intercept.