Blow their minds with just cornstarch, water and a speaker. However, the physical behavior of nonnewtonian fluid depends on the forces acting on it from second to second. We mixed corn starch and water and put it in a speaker playing a low notes from a synthesizer. Itai cohen, associate professor of physics, and his graduate student, neil lin, demonstrate the phenomenon and explain the reasons behind it. Other examples of nonnewtonian fluids include ketchup, quicksand and silly putty. Now, if youd like to know how to make your own pool of cornstarch you can run across, you can follow steve spanglers instructions.
Corn starch, a component of the nonnewtonian fluid being studied. When it comes to cornstarch, its indeterminate viscosity when mixed with water made it the perfect solution for a pretty neat trick. The wave form you need is a pure sin wave at 120 hertz. Demonstrate this by doing an experiment with speakers. So, if you heat honey, the viscosity is less than that of cold honey. Various measuring cups, for measuring the amount of water. When its hit repeatedly by something like a speaker cone it forms weird tendrils. There are no exact formulas regarding how much water to add, but it will end up being about 12 cup 120 ml of water per cup 235 ml of cornstarch. It may be a good idea to add 18 teaspoon baking powder per egg to help with leavening replacing eggs with cornstarch. Line the speaker with a plastic bag and pour the cornstarch into it. When we saw a few youtube videos that involved dancing oobleck, we decided we. The mixture is two parts cornstarch to one part water. Put some oobleck on an old speaker and watch it dance. They are great for doing interviews or shoots where the subject talks from a distance.
Now, slowly sift or spoon in cornstarch, distributing it evenly across the membrane, until the fluid begins to thicken. Water, a component of the nonnewtonian fluid being studied. The solution is thin so that the faraday waves are visible. When subject to loud sounds at certain frequencies, it even moves. Mix the cornstarch and water and pour this mixture onto the cookie sheet. You will need to make your oobleck thicker than usual. With the tone generator set around 100hz, turn on the speaker amplifier with the volume at minimum, and slowly raise the volume until the liquid is slightly agitated.
As of today, hes one of the few people with four talks featured on. Driver for the speaker i had one laying around but you can build your own, use a guitar amp, etc. Cornstarch monsters science fair experiment experiments. This non newtonian fluid will dance on a speaker, creating wild little monsters. Corn starch is a shear thickening nonnewtonian fluid meaning that it becomes more viscous when it is disturbed. An audio player that can be connected to the speaker.
Try making a mixture of cornstarch and water called oobleck. Cornstarch and water mixture on a speaker connected to a frequency generator at approx 48hz. In this project you will make your own oobleck, and then measure how many decibels it takes to make it move around and appear to come to life. Interesting properties of nonnewtonian fluids if you punch a bucket full of nonnewtonian fluid such as cornstarch, the stress introduced by the. Saran wrap, to maintain a clean speaker while experimenting with the corn starch. Nonnewtonian liguid made of corn starch and water is becoming solid under the perussive action of the speaker. If the cone is large enough to hold the oobleck, wrap the whole speaker in plastic wrap so the cone becomes a bowl. We recommend holding your iphone at a bit of an angle, with your speaker facing closer to the floor, as this can help force the water out of your speaker better. The mixture is a nonnewtonian fluid, which is liquid unless. Mix the box of cornstarch with 1 cup of water in a bowl. Turn the speaker on at about 20 hertz, with the volume at a medium level.
I saw a video on the internet where someone put a mixture of cornstarch and water into a speaker and the thick liquid looked like it came alive like a monster. They are most readily used with most youtube formats, including video blogs. We mixed corn starch and water and put it in a speaker playing a low notes. After a brief foray into the realm of visualizing sound through fire i decided to head in the other direction and watch vibrations propagate through some different kinds of fluids. Download different frequency test tones onto the music player this is what will. An awesome visualization of sound waves and frequency using oobleck. Having worked at various science centers and years of making slime and oobleck, when i saw a youtube video of cornstarch monsters, i had to try it out. But if you are rough with it, it behaves like a solid. I made this using nonnewtonian fluid cornstarch and water mixed with fluorescein. This one is very simple and the speaker is not required. Little did i know, steve wrote up his little stunt. Corn starch is a good longterm survival food storage item with an indefinite shelf life when stored in a cool, dry location. This causes audio to soften andor sound muffled, and getting that water out. How to make freaky cornstarch monsters dance on speakers.
Now im going to put my discovery on youtube and explain how i did. Goo dance party at boston childrens museum, this activity inspires and delights visitors of all ages. Engineering projectscorn starchhoward community college. An inexpensive, nontoxic example of a nonnewtonian fluid is a suspension of starch e. Playing around with cornstarch and water at baltimore hackerspace. This means that the viscosity of the substance can change due to. How to perform the corn starch and speaker experiment. Cornflour and water mixed together forms a nonnewtonian substance. When we saw a few youtube videos that involved dancing oobleck, we decided we needed to take our gooey play to the next level. Lavalier microphones can be pinned onto the subject. Boom microphones are often held above the frame of the scene on a long pole. How to make oobleck a simple recipe for making slime. Place the cookie sheet onto the speaker of the sub, and pour in the oobleck. Find an old speaker and remove the bottom part the woofer and hook it up to an amplifier.
The cornstarch will become difficult to stir, given its properties. The cornstarch water mixture, and real quicksand, are both examples of nonnewtonian fluids because their viscosity changes when stress or a force is applied. The program can take the url of the video as the input and download it to local pc. If you truly do have water stuck in your speaker, you should see it begin to either leak or spray out of the bottom of your iphone. I used water and a corn starch solution to get what i thought. Use your fingers to break up any clumps and stir the mixture until it is like syrup in texture. Oobleck is a nonnewtonian fluid that has both liquid and solid properties. The secret is to add the water slowly and mix as you add it. Exploring how sound waves affect oobleck is a great way to encourage critical early science skills, while also getting pretty silly. Treat it gently and it flows, handle it roughly and it shatters like a solid. Slime and oobleck, when i saw a youtube video of cornstarch monsters, i had to try it out.
It demonstrates the properties of nonnewtonian fluids. In this video you will see a rotating cylinder placed in cornstarch and water. Interesting shapes can be created by placing oobleck on a speaker or vibrating table, which cause the material to harden as the mechanical waves pass through it. When its hit repeatedly by something like a speaker. Corn starch and water dancing in a speaker youtube. How to get water out of your iphones speaker with a. By transmitting sound waves through any sort of medium, we are able to see different patterns emergin.
It makes a great science project or is just fun to play with. The goopy liquid should then be dumped into the speaker head. Keep the volume low so that the water doesnt splash. As a nonnewtonian fluid, cornstarch has some unusual properties. Download different songs and see what works best for you. You can download different test tones and play to see what works best for you. You should add the food coloring to your water before adding it to the powder. Download youtube videos and convert to multiple formats. When you mix cornstarch and water you get an unusual result.
The reason you can walk on water and cornstarch a new explanation of the classic cornstarch experiment may help researchers to enhance bulletproof vests, design safer helmets, and. A few years ago, i wrote a post about steve spangler and the giant pool of cornstarch he used on the ellen degeneres show. Take note of the decibels and frequency that gives the best results. Newtonian fluids like water can be described exclusively by temperature and pressure. Cymatics is the study of visible sound and visible vibrations. The strange motions are due to the shearthickening nature of the fluid. Cornstarch science quicksand goo experiments steve. The day before we did this experiment, we had made dough in the water table using flour and water, which made for great predictions when i pulled out another white powder cornstarch and asked the children to guess what would happen when i mixed it with water.
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