Book Bag Time

In my Light, Sound and Time class I was assigned to invent a time-telling device that is better than what’s already out there. The time-telling device that I decided to do was a book bag that tells you the time by the hour with a light that flashes from the straps which will vibrate too. The most challenging thing was getting the math part together and figuring out how to show the math concept for this device. What I learned from this was the different ways that time can be told or recognized. I learned that sun’s shadow can tell you the time wherever you are if you measure it right. What I am most proud of is choosing my time-telling device on time and not making it so complicated.

                                        Book Bag Time

The time-telling device I chose to do was a book bag. The straps of the book bag light up within the hour. How the book bag lights up is by the warmth of the human body, it will also vibrate when the light flashes. When the book bag is worn, the book bag then activates itself when it starts receiving the body heat from your body. For example, if you saw that the time was 2:00 pm and your book bag straps light and vibrate up that means it has been an hour meaning it’s 3:00 pm. This book bag is also a timer, you can plug your earphones into your book bag and the device will let you know how close you are getting from your time being up. How my device shows Light, Sound and Time is, with the energy that the book bag is receiving from your body the book bag will light up when the time has changed. The timer has a programmed speaker so when you plug in your earphones the speaker will tell you how much time you have left from what you put the timer for. Last but not least, Time; every time the time changes by the hour the light and vibration from the straps will let you know it’s been a full hour.

My device is meaningful and effective because instead of wearing a wristwatch, you can simply tell when it hits a different hour when the light flashes and when you feel the vibration on your shoulders. You can also put in a time you have to be somewhere and it’ll let you know when your time is up. As I was researching about book bags, I found that book bags were started to be invented in California by two couples named Dick and Nena Kelty. The Kelty’s started making bags in their California home in the early 1950’s. As I was researching, the article said “the unassuming Kelty backpack signaled a paradigm shift in backpack design by prioritizing three fundamental modern concepts”:

1. Weight Matters 
2. Durable Materials are Key 
3. User Experience is Important

How my device solves common problems today is by the light that flashes and vibrates because the light flashes when it’s been a hour. If you know what time it was before you won’t have to check your time. The timer is just regular but you can also plug in your earphones and it can tell you how close you are from the time being done. Teenagers and people with low hearing or that are blind today will be able to use these book bags.

Citations:
- "The Evolution of the Modern Backpack." Packsmith RSS. N.p., 24 Sept. 2015. Web. 18 Mar. 2016.

- "Back Pack." Back Pack. N.p., n.d. Web.

My Diddley Bow

For this unit called "Sound" we studied about the sound in frequency, wavelengths, amplitude and harmonics. Then the class and I went on a field experience to the Threshold Acoustics we learned more about how the frequency and wavelengths in sound can change with their surroundings. For this action project we were assigned to make a guitar off of recycled materials like a tin can, a piece of wood and a guitar string. What I am most proud of is getting my guitar done on time and having all materials that I need for my guitar. I am also proud of learning how exactly sound travels through a guitar. The most challenging thing was getting my guitar string to tie around the screw. The purpose of this project is to create your own guitar using recycled materials or old scraps from home.

I learned the different parts of a guitar and how it works with the sound when the strings are being played. How the guitar works is the tin can will allow the string to enter and produce the vibration/sound of the string being played. Which bounces inside the tin can producing the sound to come out. My guitar demonstrates these key science principles which are sound waves, wave lengths, frequency and amplitude.

JR. "My Diddley Bow". (2016).

Sound Wave: When the guitar string is being played/touched.
Wave Length: When or how hard you're playing the string.
Frequency: How frequent the sound is when you play the string.
Amplitude: How high the string is moving.

How I found the measurements for my Diddley bow was, I used a ruler in inches. I measured the string which measured in 7 inches. I divided that into harmonics in which I wrote down onto the wood to show where the harmonics are on the Diddley Bow. The thickness of my string is 0.038 inches. The approximate volume of my Diddley bows body is 28.5005 inches cubed. I used pi x r2 x h which I then got pi x 1.44 squared x 4 3/8. Also the approximate wavelength and pitch/ frequency of the four harmonics of my Diddley Bow

JR. "Sketch on Diddley Bow".  (2016).

How the Doppler effect shows on a Diddley bow is with the sound that comes from the string which goes through and enters the can, bouncing off of the can which amplifies as the sound that comes out.

Pinhole Camera

For this course "Light, Sound and Time" This unit is called light, it’s about the history behind light and how light works, how we perceive light and how light travels. We learned the different principles that have to do with light. My class and I learned how to measure waves, crest to crest and crest to trough. We also learned what is refraction and what refraction does to light and objects. This course was mostly about light, we were assigned to make a pinhole camera to see how light works on a pinhole camera and how the camera works by itself. I learned a lot of math and the differences on light and how it can affects what we can see and what we cannot see, because of refraction on light. The most challenging thing was the math part in the process on making the pinhole. Putting the math in it's right places was the most difficult and looking for the tangent.

My pinhole camera is made to take pictures, how my camera will take pictures is by letting the light through the pinhole that was made in the front. My pinhole camera will not perform refraction because it only happens when light is on one medium to another and my camera will be surrounded by air therefore, there is no refraction when light tries to go through the pinhole. How the camera will take a picture is by having photo-sensitive paper inside the pinhole camera, how it will be developed is by a dark room so that the picture doesn't ruin. It will also be developed in some special chemicals and then you have your pinhole picture. The reason why I covered my pinhole camera with black paper was so that the photo-sensitive paper wouldn't shine light to it and ruin the photo-sensitive paper.

JR. (2016). Pinhole Camera

My camera demonstrates light which equals energy, I chose this principle because the photo-sensitive paper will be get the light from the pin hole and it will develop right after it gets in the dark room. I measured the pinhole to the back which was 4 inches, pinhole to the bottom was 2.5 inches and the complete height of the water bottle was 10.5. 

JR. (2016). Pinhole Picture

When I placed my pinhole camera in front of the brat doll with the lights, I uncovered the pinhole and let the light go through so that the photo-sensitive paper can develop once I covered the shutter. The shutter speed was 3 minutes and covered it with duck tape and took my camera into the dark room so it can develop. This is the results that I got with the pinhole camera. If I could do something differently would be the time, because maybe if I left it longer my picture would've developed better and it would look more clear. I would also know the angle I would put my pinhole camera because as you see in the picture above it looks sort of slanted.