Ten Facts about Magnets
(from the book Driving Force) 1. North poles point north, south poles point south. 2. Like poles repel, unlike poles attract. 3. Magnetic forces attract only magnetic materials. 4. Magnetic forces act at a distance. 5. While magnetized, temporary magnets act like permanent magnets. 6. A coil of wire with an electric current flowing through it becomes a magnet. 7. Putting iron inside a current-carrying coil increases the strength of the electromagnet. 8. A changing magnetic field induces an electric current in a conductor. 9. A charged particle experiences no magnetic force when moving parallel to a magnetic field, but when it is moving perpendicular to the field it experiences a force perpendicular to both the field and the direction of motion. 10. A current-carrying wire in a perpendicular magnetic field experiences a force in a direction perpendicular to both the wire and the field. The Tricky Triangle Solve this by placing a magnetic marble in each hole. You'll find it;s very difficult and addictive. Tumbling Monkey The monkey stays on the track because of the magnets on the axis of the wheel. They are strong enough to hold the wheel to the track when its moving. But when gravity and friction slow the wheel down enough to allow centripetal force to overpower the magnetic force, it will fly off the rails on the outside curve farthest from the handle.
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Ladybugs are beetles They love to eat apids. The release should be made in the evening, just before dark. Ladybugs will not fly in the dark, or at least most of them won't. On warm to hot nights I have found it best to cool the bugs off with about 30 minutes in the refrigerator. This really slows them down and makes controlling them a lot easier, but only for a few minutes. With a minimum amount of a food supply, the ladybugs will stick around and lay eggs for the remainder of the season. Ladybugs must have a supply of Aphids and access to plant pollen for them to lay eggs that are fertile, a lot of Aphids will result in a lot of eggs. I have found that some ladybugs will settle right into their new enviroment and will stay the whole season while others will be there one day and the next they are gone. I have found that there are some types of enviroments they prefer over others but one thing they seem to thrive on is access to a sunny location that doesn't get too hot that they can gather on and sun themselves. While you are waiting for the sun to go down, lightly water the release area, this will cool everything down and give the bugs water to drink. So, you wait until it is almost dark, get the bugs out of the refrigerator and open the container. . Next morning, they may be hard to find but most of them should be there. When they are spread out it doesn't look like there are many bugs, but keep looking and you will eventually get your eyes tuned into seeing them. Now, leave them alone for a few days. Check on them in a few days and see how they are doing, they should have eliminated a lot of aphids or whatever the pest of the week is. Looking around, you should see two or three ladybugs every one to two square feet, maybe a few clusters of the pests with ladybugs eyeballing them for their next meal and an occassional solitary pest here and there. If you don't see any pests, there were too many ladybugs, if you don't see any pests or ladybugs, there were way too many ladybugs, if you see a lot of pests but no ladybugs there were not enough ladybugs or maybe too many pests. if you would like to keep a couple in your container for a week or so, feed them raisens that have been soaked in water and chopped.
We'll have fun ahead building a toy that didn't begin as a toy. In ancient times, giant catapults were used as weapons to hurl stones and other dangerous objects across great distances toward an enemy. For your enjoyment we are creating a fun-filled and peaceful toy for you and friends.
Your project, a toy catapult, is based on a small Chinese skill toy that originally launched a hard wooden ball between two cups. Measuring two feet long, this catapult project is much larger than the original toy and uses safe, soft, puff balls as its projectile. Background Information: Catapults use projectile motion to move objects across distances. A couple of factors can affect the distance an object can be launched, such as the mass of the object, and the amount of force used to move the object. Force - a push or pull. A force can make something start moving, stop moving, or make change direction. Work – work is done when we use a force (a push or pull) to move something over a distance. Energy - the ability to do work. If I have no energy, I can’t use force to make something move! • There are two different kinds of energy Kinetic Energy – the energy of motion. Potential Energy – is stored energy – it has “potential” to do something. Chemistry is the sciencce of "what things are made of" and we'll experiment with the basics this week. We'll start with talking about atoms and how different types of atoms behave diffently. Acids have atoms that give of Hydrogen ions in water and make some of the food we eat sour. Bases behave oppositly and give of Hydroxides in water and cause things to taste bitter. Cleaners usually are basic. When the two are combined, gas (Carbon Dioxide in class today) and a salt is left behind. There are different types of indicators to allow chemists to know the PH of a substance. We will experiment with cabbage juice and other indicators.
Next we will talk about solid, liquids and gases and make a CO2 balloon from an acid and base. Which group does a polymer belong to? Polymers are long skinny molecules that can be tangled to create plastics, nylon, and more. Naturally they are found in our hair, wood, and spider silk. The students will tangle some of these. Our project is to make a lip balm. We will find the melting point of shea butter and beeswax and make an emulsion of the 2 liquids after they melt. An emulsion is a mixture of two or more liquids that are normally immiscible (un-blendable). Emulsions are part of a more general class of two-phase systems of matter called colloids We'll add an emollient, almond oil, that keeps moisture from evaporating from the skin. The kids get to add their own fragrances to engineer there own special type. Our eyes are amazing but they can't allow us to see the hidden world of the small that surrounds us. Antonie van Leewenhoek built the first microscope over 400 years ago and was amazed at seeing red blood cells and bee wings. We'll bend light with a magnifying glass so that objects appear larger and try using 2 magnifying glasses together to compound the magnification. This will lead us to looking at the parts of a compund light microscope and examine how it works.
Each student will hold a model of a bacterium, virus, protozoan or cell so that we can see the variety of life on a small scale. We'll then look through the microscope sliders at cells, bacteria, and viruses. We'll also look at larger objects and use the microscope that we can see on the computer screen. We'll search through pond water to find water fleas, insect larvae and maybe some surprises. Our project this week will be to design a thinking cap. The hat will have a brain cell or neuron on top. These cells have to be magnified over 300x to be seen clearly. The brain cell has a nucleus in the center and a long axon on the end to deliver electrical signals to the dendrites at the top of the next brain cell. This is the way our thoughts travel. There are not as many tidepools here at our Carolina Beaches as on the West Coast and New England States but......if you know where to look you can spot some unique creatures this summer. My favorite spot to go looking is at a small beach cove at Fort Fisher. You park at the rocks before you get to the park and then walk to the rocks at low tide on the far right (facing the ocean). I always find anemones, sticky to the touch and usually hermit crabs (leave them there). Then end of Sunset Beach is a great spot and on the coastal waterways in the grasses at low tide is a fun place to explore as well Beware of sharp shells and thick mud that you may sink into.
Here are a few tips for great collecting this summer. Let me know what you find. 1. Check the Tides The best time for tide pooling is low tide, or as close to it as possible. You can check the tides usually in the local paper, or online using a tide predictor. 2. Bring a Book. In many areas where there are tide pools, you'll find pocket-sized marine life field guides at the local bookstore or souvenir shops. Bringing one of these along will help you identify any critters you find and learn about them. A great activity for kids: match up the animals and plants they find to identification pictures in a field. We carry a great one on the NC Coast 3. Wear sturdy shoes or boots. Going barefoot isn't usually the best choice for a tide pool. Many tide pools have piles of slippery seaweed, and scratchy critters like barnacles, snail and mussel shells. Wear sturdy shoes that you don't mind getting wet, such as sport sandals or old sneakers, or rubber rain boots. 4. Beware of Slippery Seaweed! As mentioned above, tide pool rocks are often covered with slippery seaweed. Walk safely by placing your feet on bare rocks or sand (if there is any). Encourage kids to "walk like a crab" by using both hands and feet and staying low to the ground. 5. Return Animals Exactly Where You Found Them. Some animals live in a very small area their entire lives. The limpet, for example, uses its radula to scrape a small hole in a rock, and this is where it lives. Some limpets return to that exact spot each day. So if you move an organism far from its home, it may never find its way back. So if you do touch an animal, do it gently, with wet hands, and then put it back right where you found it. 6. Don't Remove Attached Animals. Follow the "body language" of the animals you see. Do not pull an attached animal like a limpet, barnacle or sea anemone off a rock. Often you can learn more by watching an animal in its place, but if you do try to touch an animal, don't pick it up if it appears stuck. 7. Explore From the Sidelines When Possible .Instead of tramping through every tide pool you see, explore from the edge if possible and resist the temptation to pick up every organism you find. This will minimize your impact on the habitat and the animals that live there. 8. Leave No Rock Overturned. Tide pool animals often hide under rocks, so one way to find them (other than just observing a tide pool and watching them move around) is to gently lift a rock up and see what's underneath. Always put the rock back where you found it. If you flip it over entirely, you could kill marine life living on its upper or lower side. 9. Marine Animals Don't Belong in Your Bathtub. Don't bring any plants or animals home. Number one, many of them are very sensitive to the salinity and other particulars of their habitat. It also may be illegal - many areas require a permit for "collecting" marine life. 10. Bring a Bag. Bring a grocery bag with you to bring your trash home. Even better, pick up some trash that others have left behind. Litter can hurt marine life if they become entangled or accidentally swallow trash. I will post all of my class notes and comments here every week. Check in to see what we're doing in class and information about your project. Feel free to leave any comments you or your child has about our classes.
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