Reflect and Share/ Blog Post #4

(the link at the top is the video!!!)

Explain how it works/doesn’t work using scientific terminology:

By turning the handle, the rubber band on the wheel drives DCmotor to transmit electricity to the LED light. A generator is a device that converts mechanical energy into electrical energy, my product shows how does DC motor can be converted into a Generator to produce the electrical energy.

Both motors and generators run because of something called electromagnetic induction. It’s discovered by Michael Faraday. The voltage is created through motion. The amount of voltage induced depends on the number of loops in the coil of wire, as well as the speed at which the magnet is moved through the coil. A greater number of coils means a greater amount of voltage is induced. Similarly, the faster the magnet is moved through the coil, the more voltage you get.

In my product, when I turn the handle, the rubber band rotating the gear and then the gear spin the DC motor. A generator produces electricity by rotating a coil in a stationary magnetic field, and in a motor, a current is passed through a coil, which forces it to spin.

Explain the areas you were successful in the product/process

  1. I think I’m better at planning and managing my time because I can basically follow my original plan.
  2. I learned how to use different materials, tools, and methods during the process
  3. My final product is working!!!!!!!!!!!!!
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Create and Improve/ Blog Post #3

Day #1

My first step was to connect the two CD together to form a wheel. My plan was glue the tape roll between two CD then use the clay to fill inside the tape roll area, lastly run a hollow tube through the hole of the two CDS. But the hole of the CDs are not big enough, so I decided to use the drill to make the hole larger. It works!

I made a 30cm*20cm base, two 11.5cm*3cm stands, and two bevel edge stands. I used hot glue to connect them, it works really well.

Day #2

I decided to use a straw (it’s very fit in the hole) to go through the “CD wheel” which can hold the “CD wheel” on the holder.

On the top of the two stands, I made two hollow tubes. Therefore, the straw can go through it.

I made a handle on the left side, it is for left-handed people. Because the handle is made of wire, I added some red tape on the handle to increase the safety factor.

Day #3

I used a rubber band to connect the CD wheel and the DC motor. Additionally, I put a gear on the DC motor, it can fix the rubber band and boost the speed of DC motor. 

I used a CD to be the major important material of the light. The first time I chose to use separate wires and LED lights to connect with the DC motor, but the contact is not good, the light is not easy to light. So the second time, I choose to use LED light that already connected with the wire, that’s works much better.

Day #4

This piece of paper has been hollowed-out by me, and while the lights have been running through “Joyful”, “Joyful” can also be printed on the wall so that the generator has become the projector. And the small thing can help to put the paper.

After I had done everything, I decided to paint my design so that it would be more beautiful and attractive which can make my audience more enjoyable.

Gather feedback from others:

The generator doesn’t work sometimes. (the light is not lighting)

In my statement above, I said that I added gears to make DCmotor rotate faster. I also used LED light wire instead of the separate one.


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Develop and Plan Blog Post #2

Techniques needed: hot glue, how to use saws, how to connect wires.

My plan:

Wednesday: Finish the base of the generator, place the DC motor, Make two CD together

Friday: Secure the CD parts and the DC motor on the sun board

Tuesday: Finish the LED light part

Thursday: the whole generator must be done

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Define and inquire

What is this engineering task?

energy transfer

What are you thinking about doing?

I thinking of making a car potential energy

This is a great idea for me to design my own thing. I think I might change something on this design.


I think the previous might work not really well.

What is the engineering task?

design a toy that converts energy

I’m thinking about creating a generator. A generator is a device that converts mechanical energy to electrical energy.

Things that I need to use:

1) 7V DC Motor 2) LED Light 3) Old Marker 4) Sketch pen 5) Old CD 6) Bottle Cap 7) Rubberband 8) Sun board 9) Cello tape ring 10) Metal Wire  11) Clay

I want to make the LED light to project some patterns or words. I can make some cards with a hollowed-out design. When the Light projected onto a piece of paper, the light can go through the hollow-out space and projected on the wall.

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Documentary video- feedback

I use “Powtoon” to create my documentary video about Gender Equality in China. This video shows my understanding and research of my topic. I think I did pretty well on the design and the information. In the video, it shows many examples of gender inequalities. I think next time, I can make the video more interesting and more clear.

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Catapult Project

This project, we created a catapult use many materials such as rubber bands, bottle caps and popsicle sticks, etc.

The most important learning in this project may be related to standards, vertex, and factored forms. I know how to use these three forms, but this project made me use them more, so I became more familiar with them. Also, I learned how to use Logger Pro properly.

The most challenging part for me was actually building the catapult, as everything works in the theory. But when actually try to apply that to the real world, is not working very well. We need to define the problems and solve it.

I would probably design my catapult to shoot further if I could choose one thing to do differently. Even though our catapult can shoot very accurately, but the distance was short.

This project helped me in my understanding the quadratic by using three form of functions correctly.

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Science Polymer Project Journal #4

Prototype 1:

2 cm of glue

4 ml borax

50 ml liquid starch

10 ml water

10 ml PVA

Prototype 2: (Our final product)

40 ml white glue

9 ml borax

5 ml water

Simply pour all the substances into a cup and stir till everything mixes together. Then knead the polymer once it has a shape.

Final Reflection: 

For the past few weeks, Harry and I have been testing and testing to find the perfect polymer for the “Omni-Potent Cushioning.” This cushioning is primarily applied on seats but can act as a heat insulating material, a cooling, and a shock absorber for your phone.  We tested our prototype and put ourselves in the shoes of people who face terrible bike seats on public bikes. Although our first Prototypes were not ideal, we continued to test and refine our polymer. Finally, after four classes or so of fastidious refinements,  we created a polymer that we were, overall, pretty satisfied with (we did find out that Prototype 1 was definitely more comfortable though, so we’ll be marketing both Prototype 1 and 2). All in I believe that my partner and I worked hard to create a product that can have a real-world impact.

This is our final video:


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Elevator Pitch about Gender Inequalities
This is a video of my elevator pitch about our Capstone project. I’m talking about a big issue around the world, which is “gender inequalities”. The elevator pitch can help us to practice the formal presentation skills, and clarify our research.

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Polymer Project-Journal #3

Harry and I are creating a polymer that can do everything, but our main focus is to act as a cushion for public bicycles. We want our polymer to have the ability hold its shape, have a cool temperature, and have a soft surface.  After testing the base polymers: boogers, super slime, and gloop during science, we decided that we would make our final product soft like boogers, but be able to keep its shape like gloop.

We want the Physical Properties to include:

  • Cool
  • Not slimy
  • Soft
  • Flexible
  • Water prove

Prototype # 1:

2 cm of glue

4 ml borax

50 ml liquid starch

10 ml water

10 ml PVA

1/2 a day of sunshine.

Goal: Successfully create a product that can hold its shape.

Our first prototype used traits of “Boogers” and “Gloop” to create the procedure. We notice “Boogers” are very soft and “Gloop” can keep its shape.


Bounce Test

Bounces 4 cm off the table.

Shape Test:

The slime dropped after about 40 seconds.

Stick Test:

This slime was sticky.

Through the test, we notice that our prototype # 1 is too slimy and sticky, and it also cannot keep the shape. Those traits are not useful for our final product.




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Science Polymer Project Journal #2


Our Specific goals:  

The goal of our polymer project is to create a polymer that can make a soft and comfortable cushion for bicycle commuters.

Target Market Audience:

Our target market audience is public bicycle commuters.

How will this help them?

Everyone has a bad memory of sit on an uncomfortable seat. All the bicycle companies want to save money, so quality is often times damaged. But if we can design and create a product that could change those uncomfortable seats to some soft seat by using a soft and cool polymer.


Using Observations of Base Polymers:

We notice that “Super Slime” is not really slimy and it feels really cool. These features are important, because of we want our products not feel weird and slimy in its bag. Also, the temperature of the slime could make the seat be much cooler in the hot summer.

We notice that “Boogers” were too slimy, I don’t think that is helpful for our product because is too sticky.

We like how if we were to put something akin to “Gloop” in our final product in a bag, it would be durable and pretty soft.

 Describing Our Polymer

 We want our products Physical Properties to include:

  • Cool
  • Flexible
  • Soft/Gel that doesn’t stick, not slimy
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