Ayrton Oneill
Oobleck, named after the Dr. Seuss book *Bartholomew and the Oobleck*, is a non-Newtonian fluid made from cornstarch and water. It can behave like a solid or a liquid depending on how much pressure is applied. While the cost of a basketball varies depending on quality and materials, with cheaper alternatives available at Walmart and Target, a basketball made of oobleck would likely be messy and not advisable.
Characteristics and Values of a Basketball-Sized Oobleck
| Characteristics | Values |
|---|---|
| Ingredients | Corn starch and water |
| Consistency | Liquid yet solid |
| Amount of Corn Starch | 1.5-2 cups |
| Amount of Water | 1/2 cup (120 ml) per cup (235 ml) of corn starch |
| Food Coloring | Optional; a few drops |
| Texture | Similar to whipped cream |
| Behavior | Acts like a liquid when poured, and like a solid when a force is applied |
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What You'll Learn
Oobleck's non-Newtonian properties
Oobleck is a non-Newtonian fluid, exhibiting properties that are distinct from those of typical liquids and solids. Created by mixing cornstarch and water in specific proportions, it behaves like a liquid when left undisturbed, but stiffens when subjected to pressure or manipulation. This unique behaviour has long puzzled scientists, who have struggled to explain the underlying reasons for this transformation.
The non-Newtonian nature of oobleck is characterised by its variable viscosity, which depends on the applied stress or force. Unlike Newtonian fluids, which follow Newton's law of viscosity, oobleck's viscosity is not constant and can change dramatically under stress. This is evident when oobleck is quickly tapped, causing it to harden as the cornstarch particles are forced together. Conversely, slowly dipping your hand into the mixture allows the particles to move out of the way, resulting in a liquid-like sensation.
The viscosity of oobleck can be manipulated by adjusting the ratio of cornstarch to water. If the mixture becomes too runny, adding more cornstarch can increase its viscosity, while adding water can reduce thickness if it becomes too solid. This customisability allows for experimentation to observe the non-Newtonian behaviour across a range of viscosities.
The University of Chicago's Pritzker School of Molecular Engineering has made significant contributions to understanding the science behind oobleck-like fluids. Researchers employed piezoelectric nanoparticles, which respond to pressure, to investigate the transition of oobleck from a fluid to a more solid state. They discovered that friction between particles played a crucial role in this transformation, paving the way for the design of new non-Newtonian fluids with practical applications.
In summary, oobleck's non-Newtonian properties manifest in its ability to change viscosity in response to stress and pressure. This behaviour has intrigued scientists and led to ongoing research that could unlock innovative developments in material design and other fields.
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The science behind Oobleck
Oobleck is a non-Newtonian fluid with properties of both liquids and solids. It is made by suspending starch in water. The starch grains do not dissolve in the water, and this forms the basis of its unique characteristics. When at rest, the high surface tension of the water causes droplets to surround the starch granules, acting as a lubricant and allowing the grains to flow freely.
However, when a sudden force is applied to the mixture, the water is pushed out from between the starch grains, and they are jammed against each other. This phenomenon is called shear thickening, where particles in a dense suspension resist further compression in the direction of shear. Thus, Oobleck's viscosity changes based on the force applied to it. When slowly stirred, it has a low, liquid-like viscosity. However, when punched, a rapidly growing zone of the slurry becomes more viscous, causing the surface to bounce back and resist the impact, behaving like a solid.
The speed and force with which Oobleck is disturbed determine its viscosity. When disturbed quickly and forcefully, the underlying particles of Oobleck create friction and stick together, making it "clumpier". On the other hand, when slowly and gently deformed, Oobleck is less viscous, with particles that repel against each other and remain more evenly distributed, behaving more like a liquid.
Oobleck's unique properties have fascinated people of all ages, especially children, who can learn about the basics of physics through simple experiments with this slime.
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How to make Oobleck
Making Oobleck, also known as the Dr. Seuss Science Experiment, is a fun activity for people of all ages. Oobleck is a non-Newtonian fluid, meaning it behaves like a liquid when being poured, but like a solid when a force is applied to it. You can grab it and then watch it ooze out of your hands!
To make Oobleck, you will need corn starch and water. Food colouring is optional but recommended to make the experience more fun and engaging. You will also need a bowl for mixing and a camera to capture the fun moments!
Start by pouring one cup of water into the bowl. If you're using food colouring, add a few drops of your chosen colour to the water and mix it well. Then, slowly add in the corn starch, starting with 1.5 cups. Mix the corn starch into the water with your hand. The goal is to achieve a consistency where the Oobleck is both liquid and solid. If it feels too liquid, add more corn starch, a little at a time, until you get the desired consistency. If you add too much corn starch, simply add a small amount of water to adjust the consistency.
Once you have your Oobleck ready, you can try out different tricks. Grab a handful and squeeze it, watching it ooze out between your fingers. Make a puddle and quickly drag your fingers through it, observing how it reacts. Put some into a plastic container and shake it or bump it against a table. You can even try jabbing at the Oobleck and slowly letting your finger sink in.
Remember to dispose of the Oobleck properly when you're done. Do not pour it down the drain as it can get caught in the drain trap. Instead, throw it in the trash or mix it into the soil in your garden. Enjoy the fascinating world of Oobleck!
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How to dispose of Oobleck
Oobleck is a non-Newtonian fluid made from cornstarch and water. It is often used in science experiments and educational activities to demonstrate the properties of non-Newtonian fluids. While it is non-toxic, it is important to ensure that children playing with Oobleck do not ingest it or spread it around.
- Collect all the Oobleck in large, sealable containers. Make sure the containers are sturdy and can handle the weight of the Oobleck.
- Instead of disposing of it, consider reusing Oobleck for educational and recreational purposes. For example, you can use it for science experiments, art projects, or sensory play.
- If you have large quantities of Oobleck and cannot reuse it, you can compost it. Break the dried Oobleck into smaller pieces and mix them with other compostable materials like fruit peels, vegetable scraps, and leaves. Ensure your compost pile remains moist and aerated, and turn it regularly to promote decomposition.
- If composting is not an option, you can dispose of Oobleck in the trash. Place the dried Oobleck in a biodegradable bag and seal it tightly to prevent spillage. Then, dispose of the bagged Oobleck in your regular trash bin, following your local waste disposal regulations.
By properly disposing of or reusing Oobleck, you can reduce waste and minimise its environmental impact.
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The cost of a basketball
The average price of a good-quality basketball ranges from $30 to $100. For example, a replica Spalding NBA basketball, suitable for both indoor and outdoor courts, can be purchased for around $40.
Some stores, such as Walmart and Target, offer high-quality basketballs at more affordable prices. These balls may have been sitting on the shelves for a while, but they still offer a good value for money.
It's important to note that the cost of a basketball hoop is separate from the ball itself. When considering the total cost of playing basketball, one should factor in the price of a hoop, which can vary depending on the brand and features.
In conclusion, the cost of a basketball can vary significantly depending on the type, quality, and retailer. Whether you're a beginner or a seasoned player, it's important to choose a ball that suits your needs and budget.
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