413-655-0146 X5109 Please leave a message! I am checking my voicemail periodically throughout the week. If you have an emergency please email me email@example.com and I will contact you immediately!
I am on vacation for the week of Aug 17th, if you have an emergency please call 413-655-0146 X1 There is someone checking these messages regularly!
Hello everyone, I hope that you are all well and being safe. You can pick up your supplies for the entire week at the DALTON PUBLIC LIBRARY after 2:00 PM. If you are attending the STEAM group in person, I can bring your bag with me on Tuesday morning. I have safely packaged these items with gloves, and sanitized with bleach and water. The items will be bagged with your name on it if you have registered with me. Even if you are unable to attend the group on zoom, please try the activities with your kids when you have a minute. NOTE: If you registered for last week I will make you a bag, unless you tell me otherwise. If you haven’t previously registered please do that. This is a different registration from Tuesday’s in person STEAM Group https://docs.google.com/forms/d/e/1FAIpQLSd_42mFnPHdOUQ8QEOAyAK-bVx6K0ALXiNrprr2FN_-71O2Yg/viewform?usp=pp_url
Air is Matter
- A bottle – (in your bag)
- A funnel
- Clay or playdough (In your bag)
- Optional – food coloring to give the water some color
First, put the funnel into the bottle, what would happen if we poured water into it. The water would flow into the bottle.
Then, seal the space between the funnel and the bottle with modeling clay. You’ll want to be sure that you have a good seal. If any air can get through the space between the funnel and the bottle, the experiment won’t work! One good way to do this is to wrap the clay around the funnel first.
Then squish the funnel and clay down into the bottle. Smooth out the clay with your finger and make sure there are no gaps.
Pour water into the funnel and watch what happens! You’ll want to pour quickly.
Why doesn’t the water flow through the funnel?
The reason this works is that air is taking up space in the bottle. Water cannot enter the bottle unless some air is able to leave the bottle. If you pour slowly, you can still fill the bottle with water because there will be enough room in the opening of the funnel for both water and air. But if you pour very quickly, a small amount of water will make it into the bottle (you can see this in the photo), and then the opening will fill with water, and the water will block the flow of air and remain in the funnel!
After you have had a chance to appreciate how cool it is that the water is staying in the funnel, have them squeeze the bottle a little. They will be able to see air leaving the bottle in the form of bubbles rising up through the water. Once some bubbles of air have left the bottle, some water will flow down into the bottle. But it will only be the same volume as the air that left the bottle!
Non-Newtonian Fluids – Understanding Newton’s Law of Viscosity
Isaac Newton had a number of theories around fluid dynamics. With oobleck we have a non-Newtonian fluid because it doesn’t follow Newton’s Law of Viscosity which states: the shear stress between adjacent fluid layers is proportional to the negative value of the velocity gradient between the two layers.
Well, I’m sure that makes everything as clear as our magic mud.
So let’s dig into this science a bit and see if we can make some sense of it. This is important stuff if you are presenting a science fair project!
The behaviour of a fluid while flowing is affected by two key properties of the fluid: density and viscosity.
Density is the mass of an object divided by it’s volume. It is the reason ice floats in your drink, ice is less dense than your drink. Or why oil floats on water. Again oil is less dense than water. Lighter fluids will float on heavier fluids.
Viscosity is a fluid’s resistance level when flowing. Think of how water flows compared to molasses. Molasses has much higher viscosity. A simple experiment to demonstrate viscosity is to compare how clean water flows compared to water filled with dirt (aka mud). Mud has much higher viscosity than clean water.
So when we are looking at Newton’s Law of Viscosity we are discussing how fluids react due to the friction created between the molecules when flowing. If there is a lot of friction, it is a thicker liquid and has a higher viscosity.
So Newtonian fluids follow this law of viscosity and flow predictably.
Then there is our beloved Oobleck, a non-Newtonian fluid, that breaks all the rules Sir Isaac Newton so carefully crafted and proposed.
States of Matter – Is Oobleck A Solid or A Liquid?
If you have ever played with oobleck you know it doesn’t behave the way you would expect at all. When you apply force to oobleck it becomes a solid. You can actually walk on it, or mold it like play dough, as long as you keep the force up.
But then something a little magical happens. As soon as you release the force and pressure, it turns into a flowing liquid. If you are walking on it and stop, you will sink. If you are squishing it like play dough and relax your hand, it will flow through your fingers.
This phenomenon is called “shear thickening” and it occurs in materials made up of microscopic solid particles suspended in a fluid. Oobleck therefore is a suspension. The solid molecules are not dissolving in the liquid, they are simply suspended. When you make oobleck you will see it quickly separates. The suspended molecules settle to the bottom and the liquid rises to the top of the container. Want to know more about the study of shear thickening? Check out this article. https://news.cornell.edu/stories/2015/11/secret-oobleck-revealed-last
Pro Tip! If you have kids that need some finger strengthening exercises, give them a batch of oobleck with some items hidden in it. It will give them a great finger workout! It is also a great way to work on “gentle” fingers, because the harder you push, the more solid oobleck becomes. Gentle fingers and pressure are the key to working your way through Oobleck.
What is Oobleck?
Oobleck got it’s name from a 1949 Dr. Seuss book called Bartholomew and the Oobleck. It is a goopy slime that does something your normal slime will never do, it turns solid when you squeeze it or apply pressure. Most liquids solidify due to temperature change, think of water turning to ice. Oobleck turns solid with pressure.
It’s crazy simple, and the results are soooo cool! All you need is:
2 Cups Cornstarch
1 Cup Warm Water
Mix the cornstarch and water together with your hands so you can feel when it is all mixed and ready to play. Again it will become solid under pressure, then liquefy when pressure is removed. It helps if you can have a helper ready to add a little water or cornstarch if you feel it needs it.
Coloring your oobleck is simple, simply add food coloring during the mixing process.
My little guys played with this for over an hour and the oobleck was still going strong. They really love this stuff. It is fascinating. Try slapping it, and it stays solid!
NOTE: Never put Oobleck down the drain or you will get a BIG bill from the plumber. Simply scrape it into the garbage and then wash everything with lots of water. If it falls on the floor, let it dry. The water will evaporate, leaving just the cornstarch powder which you can sweep up.
I warned you, this stuff is crazy weird.
Today you get to make a Plushy Pal! Is it a Solid, Liquid or Gas? He comes with a mask and a t-shirt.
Wednesday Circle Time with Miss Wendy
Days of the Week (tune of the Adam’s Family):
Days of the week(clap clap)
Days of the week
Days of the week
Days of the week (Clap Clap)
There’s Sunday and there’s Monday
there’s Tuesday and there’s Wednesday
There’s Thursday and there’s Friday
And then comes Saturday!
Calendar, Weather, alphabet
I have, who has? game
FEED THE MONSTER!
Good bye song!
Thursday Story Time
Clark the Shark Goes to School
We are going to make Clark the Shark – the supplies you need are in your bag!
Friday – Kindergarten Readiness
Wiki Sticks shapes
First Name, Last Name
Fine Motor Alphabet and counting