What happens when hot meets cold? Just ask the fourth graders. In exploring thermal energy, the students conducted a simple experiment called hot meets cold. In this experiment, the students observed two jars, one with hot water and one with cold water. They placed them into a container of water, poked a hole in each jar and waited to see what would happen.
Many of the students explained to me that they saw the hot water (red water) move upward and the cold water (blue water) move to the bottom. One students explained that the blue water is going down because it is denser or heavier than the hot water, which is lighter. Another student compared it to being in the ocean. He explained that when hanging out in the water, he sometimes feel the cold water on the bottom and the warmer water at the top. Then another student realized that this experiment was like a thermometer. When the liquid in the thermometer gets hot it expands up and when cold it contracts and goes down.
Join the world for EARTH HOUR 2013 on March 23 at 8:30 p.m.
Around the world millions of people in hundreds of countries shut off their lights to show their support for global climate change awareness. Take action by showing your support for a better future. See this year’s official Earth Hour 2013 video.
What will you do?
Want to learn more about Earth Hour 2013, click HERE.
Today we’ll also be signing into my online classroom in Edmodo. This is a new web 2.0 tool that we will occasionally be using throughout the year. I’m new at using this tool and so we’ll be learning together how we can use this in our science class. I’m really excited to show you this new web 2.0 tool that I’ve love to use in science. I hope that you enjoy it too.
One of the new web 2.0 tools that the teachers learned at our in-service yesterday was Tiki Toki. It is an online customizable timeline. Here participants can add “stories” to the event timeline. In our class today, we’re going to try it out. See the sample below of our Birthday Timeline. We’ll be adding our birthday to the timeline. This way, we can see if anyone has the same birthday. Click on the link below to get to the site.
What causes the Earth to change? Some of the ways that the Earth is constantly changing is by weathering and erosion. Weathering is the breaking down of rocks and other materials. Erosion is the carrying away of these broken down particles by running water, glaciers, wind and waves. To demonstrate the affects that wind and water have on the land, the 4th graders conducted an experiment.
Representing their islands was a large mound of soil. Students were given small hand held fans to simulated the blowing wind. Then they were given a cup of water to simulated a flood or rainfall, as some sprinkled the water over the land. What were the results? Check out what happened by watching the video below.
Did you know that scientist believe that the Earth’s continents were once one giant big one? Scientist call it Pangaea. The Earth’s outer most layer, the crust, is broken up into many different sections called plates. This plates move around as it “floats” on top of the liquid magma. As these plates move around, so to the continents that sit on top of the crust.
Being that the Earth is so huge and imaging a moving Earth can be quite hard, the 4th graders used a smaller model, an EGG. Pretending that the Earth is the egg and the outer shell is the crust, students gently created plates by cracking the shell. Using a marker, students outlines the cracks, which is now representing the Earth’s plates.
Students were then asked to gently squeeze the egg shell to see what happens when plates move around. What do you think happens when the shell is squeezed? Ask a fourth grader and see what they learned.
Ever wonder how those big cranes can lift of the Matson container at the shipyard? Or how cranes can lift of the steel bars and hull them up to the top of a 50 story building? It’s all about simple machines, but a particular simple machine called a pulley. Basically it is just a string wheel that allows a string to pass through as it pulls a load.
Well, the fourth graders were given the task of building a pulley in order to move a load. If their case, a bottle of gravel. Students were also measuring how much force it took to move that load by using a spring scale. There were two types of pulleys they built, tested and compared: fixed pulley and a fixed pulley. Using these two types of pulleys they were to compare how much effort it took to raise the same bottle of gravel.
Which one do you think too the least amount of force to lift?
Simple machines make work easier. As the fourth graders build and test out various types of simple machines, they are exploring how these machines make work easier. One of the experiments they conducted was to see how friction plays a role in moving objects. Students are learning how to measure effort by using a spring scale. This experiment had the students observing how different surfaces (sandpaper, table top, and oiled table top) make pulling an object easier or harder. Can you guess which surface would be the hardest? Can you guess which surface would be the easiest? If you can’t guess, ask any fourth grader.
The 3rd trimester started a few weeks ago and students are in full swing into their new units. Below are brief descriptions of what each grade will be exploring during the 3rd trimester.
Changes in Animals – How do animals grow and change? What is a life cycle? What is the life cycle of plants and animals? How do baby animals look similar or different from their parents?
Energy – How does the sun warm things?
Motion – Why do things move and fall? What are forces? What is gravity? What makes objects stop?
Magnets and Force – What can magnets do to other objects? What makes magnets attract or repel objects? How do people use magnets in their everyday lives? What is a force? What are magnets?
Forms of Energy – What are three main forms of energy? How does light move and what happens with it hits something? How does sound travel and move? How can heat make things change and move?
Work by Simple Machines – What are simple machines? How do simple machines make work easier? What are the 6 main simple machines and how do they work?
Energy and Transfer – What are ways that people use energy? Where does our energy come sources come from on the Island of Hawai`i? How does energy change from one form to another? How to use solar power to run a boat?
Right now Iʻm sitting at home cooking and watching the ABC News. The first story that Diana Sawyer reported was about the mass of deadly tornadoes that hit the mainland United States. There are still a tornado warning in many states. It was shocking to see the damage and hear the stories of the survivors. Itʻs so sad to see the before and after pictures. We need to keep in prayers the dozen of people who were killed in these series of tornadoes. Hereʻs a video clip from ABC News on the story.
Do you love to write poetry or short stories? How about creating artwork with color pencils, markers, or or other art supplies? Do you love whales too?
Well, why don’t you participate in the 2012 Humpback Whale Month Ocean Contest by submitting your work to the Hawaiian Islands Humpback Whale National Marine Sanctuary. They are currently accepting entries for their 2012 contest.
All entries are due by 12:00 noon on March 15, 2012.