An inexpensive, nontoxic example of a nonnewtonian fluid is a suspension of starch e. Newtonian fluids like water can be described exclusively by temperature and pressure. The cornstarch water mixture, and real quicksand, are both examples of nonnewtonian fluids because their viscosity changes when stress or a force is applied. Try making a mixture of cornstarch and water called oobleck. This means that the viscosity of the substance can change due to. How to perform the corn starch and speaker experiment. Cymatics is the study of visible sound and visible vibrations. When we saw a few youtube videos that involved dancing oobleck, we decided we. I used water and a corn starch solution to get what i thought. Line the speaker with a plastic bag and pour the cornstarch into it. 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. You should add the food coloring to your water before adding it to the powder.
Download youtube videos and convert to multiple formats. Boom microphones are often held above the frame of the scene on a long pole. Cornstarch and water mixture on a speaker connected to a frequency generator at approx 48hz. Blow their minds with just cornstarch, water and a speaker. The secret is to add the water slowly and mix as you add it. 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. 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. How to get water out of your iphones speaker with a. Download different frequency test tones onto the music player this is what will. Place the cookie sheet onto the speaker of the sub, and pour in the oobleck. Interesting properties of nonnewtonian fluids if you punch a bucket full of nonnewtonian fluid such as cornstarch, the stress introduced by the. By transmitting sound waves through any sort of medium, we are able to see different patterns emergin. 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. Various measuring cups, for measuring the amount of water.
The goopy liquid should then be dumped into the speaker head. Little did i know, steve wrote up his little stunt. Water, a component of the nonnewtonian fluid being studied. It may be a good idea to add 18 teaspoon baking powder per egg to help with leavening replacing eggs with cornstarch. This non newtonian fluid will dance on a speaker, creating wild little monsters.
A few years ago, i wrote a post about steve spangler and the giant pool of cornstarch he used on the ellen degeneres show. Download different songs and see what works best for you. When it comes to cornstarch, its indeterminate viscosity when mixed with water made it the perfect solution for a pretty neat trick. The mixture is a nonnewtonian fluid, which is liquid unless. Use your fingers to break up any clumps and stir the mixture until it is like syrup in texture. 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. Slime and oobleck, when i saw a youtube video of cornstarch monsters, i had to try it out. They are great for doing interviews or shoots where the subject talks from a distance. Saran wrap, to maintain a clean speaker while experimenting with the corn starch. Mix the box of cornstarch with 1 cup of water in a bowl. 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. Oobleck is a nonnewtonian fluid that has both liquid and solid properties. They are most readily used with most youtube formats, including video blogs.
It makes a great science project or is just fun to play with. Find an old speaker and remove the bottom part the woofer and hook it up to an amplifier. 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. We mixed corn starch and water and put it in a speaker playing a low notes from a synthesizer. Demonstrate this by doing an experiment with speakers. When its hit repeatedly by something like a speaker cone it forms weird tendrils. You can download different test tones and play to see what works best for you. Corn starch is a good longterm survival food storage item with an indefinite shelf life when stored in a cool, dry location. Corn starch is a shear thickening nonnewtonian fluid meaning that it becomes more viscous when it is disturbed. This causes audio to soften andor sound muffled, and getting that water out. When subject to loud sounds at certain frequencies, it even moves. The strange motions are due to the shearthickening nature of the fluid.
It demonstrates the properties of nonnewtonian fluids. Corn starch and water dancing in a speaker youtube. As of today, hes one of the few people with four talks featured on. Cornstarch monsters science fair experiment experiments. When its hit repeatedly by something like a speaker. Whether you dropped your iphone into a toilet or shower with it on a regular basis guilty, some water will likely become nestled inside its speaker grilles. How to make freaky cornstarch monsters dance on speakers. But if you are rough with it, it behaves like a solid. Mix the cornstarch and water and pour this mixture onto the cookie sheet.
Now im going to put my discovery on youtube and explain how i did. Playing around with cornstarch and water at baltimore hackerspace. I made this using nonnewtonian fluid cornstarch and water mixed with fluorescein. 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.
Driver for the speaker i had one laying around but you can build your own, use a guitar amp, etc. As a nonnewtonian fluid, cornstarch has some unusual properties. The cornstarch will become difficult to stir, given its properties. We mixed corn starch and water and put it in a speaker playing a low notes. Itai cohen, associate professor of physics, and his graduate student, neil lin, demonstrate the phenomenon and explain the reasons behind it. Treat it gently and it flows, handle it roughly and it shatters like a solid. Turn the speaker on at about 20 hertz, with the volume at a medium level. An audio player that can be connected to the speaker. So, if you heat honey, the viscosity is less than that of cold honey. Put some oobleck on an old speaker and watch it dance. After the children made their predictions, i went ahead and mixed the solution. If the cone is large enough to hold the oobleck, wrap the whole speaker in plastic wrap so the cone becomes a bowl.
Now, slowly sift or spoon in cornstarch, distributing it evenly across the membrane, until the fluid begins to thicken. Nonnewtonian liguid made of corn starch and water is becoming solid under the perussive action of the speaker. The wave form you need is a pure sin wave at 120 hertz. Engineering projectscorn starchhoward community college. In this video you will see a rotating cylinder placed in cornstarch and water. Cornstarch science quicksand goo experiments steve. An awesome visualization of sound waves and frequency using oobleck. Other examples of nonnewtonian fluids include ketchup, quicksand and silly putty.
When we saw a few youtube videos that involved dancing oobleck, we decided we needed to take our gooey play to the next level. 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. Exploring how sound waves affect oobleck is a great way to encourage critical early science skills, while also getting pretty silly. The program can take the url of the video as the input and download it to local pc. Goo dance party at boston childrens museum, this activity inspires and delights visitors of all ages.
Corn starch, a component of the nonnewtonian fluid being studied. How to make oobleck a simple recipe for making slime. The solution is thin so that the faraday waves are visible. 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. Cornflour and water mixed together forms a nonnewtonian substance. Lavalier microphones can be pinned onto the subject. The mixture is two parts cornstarch to one part water. Now, if youd like to know how to make your own pool of cornstarch you can run across, you can follow steve spanglers instructions. 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. This one is very simple and the speaker is not required. When you mix cornstarch and water you get an unusual result. You will need to make your oobleck thicker than usual.