We had a fun sports day! I loved hearing the students cheer each other on! We have some great team players and athletes in our class! Check out he great pictures!
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Sound is caused by vibrations. When something vibrates, the air particles around it vibrate. Those travel to our ear, which causes our ear drum and then small tiny bones in our inner ear to vibrate. That causes a nerve to send an electrical signal to our brain that says it's a sound.
We made chicken cups today. In our lab, we saw that when we played the string, that was mechanical energy. The mechanical energy of us moving our fingers up and down the string led to friction. Friction caused the string to make sound. You can't have sound energy without mechanical energy. Something is always moving to make a sound. The cup amplified the sound. The viration of the string, caused the particles in the air to vibrate which hit the cup and led to our ears. Frequency is how often the sound waves occur. Our vocal cords and strings on instruments work a lot a like. The length determines the pitch. Small vocal cords vibrate faster, so they have high frequency sound waves. This leads to a high pitched voice. Short harp strings do the same. They vibrate faster, so they produce a high pitch sound. Big vocal cords vibrate more slowly, so they have lower frequency of sound waves. This means people with bigger vocal cords have lower voices. In our chicken cup lab, the length and thickness of the string determines the pitch. The shorter, the higher. The longer, the lower. The cup size determines the loudness, or the intensity or volume. The bigger the cup, the louder the sound. Energy is the ability to do work. There are many forms of energy. We are going to learn about how different forms of energy travel, conductors and insulators of those forms of energy and how they work.
Here are some forms of energy we will learn about this year: Mechanical Energy = Movement Energy Thermal Energy = Heat Energy Chemical Energy Light Energy Solar Energy Wind Energy Sound Energy Electrical Energy We will also learn about alternative energy sources that are renewable or inexhaustible later on: Geothermal Energy Hydroelectric Energy Solar Energy Wind Energy Nuclear Energy Biofuel What are lunar eclipses and when is the next one?
What it looked like More Info Lunar Eclipse explained Lunar Eclipse Essentials Lunar/Solar Did you get to see the lunar eclipse last night? It was pretty cool! We will learn a lot more about the moon phases, shadows, day and night, and the earth and moon's rotation and revolution when we do our Space unit in a couple months. I did want to give you a few links and some info on the eclipse now, since one just occured. A lunar eclipse only happens when the moon is lined up in earth's shadow. That means it will always occur during the phase of a full moon. Watch the videos above to see an animation of this occurring. The earth is blocking the sun light from hitting the moon. It looks slightly red because red and orange are the longest wavelengths and are the only colors to reach the moon through the earth's atmosphere at that time. That is also why we have orange and red sunsets. Why is a blood moon red? Blood Moon We had so much fun learning about density. We learned that when liquids and objects had a volume of matter in them they either mixed or didn't mix (float or didn't float).And when that happens, density is in the object or liquid.WE concluded in our lab that some objects have more density than others. Mixtures are when 2 or more things/substances are mixed together. One type of mixture is a solution. A solution is when two substances get mixed together and their physical properties change. This is when something gets dissolved, broken down and evening distributed amongst the liquid. Examples of a solution are salt water, sugar water, kool-aid, cake mix, lemonade, coke, tea....
Mixtures that are only mixtures and not also solutions are just 2 or more things mixed together and they stay the same even when mixed. Examples of mixtures are: salad, rocks and water, sand and water, types of coins in a bag, different toys in a room, boys and girls in a class... 2 or more things mixed together, not affecting or changing the other. A metal is magnetic if all of it's electrons, tiny charges smaller than particles, can and do line up in the same direction. Each electron has a north and south pole and when all the electrons line up, all of their south poles go in one direction and all of their north poles go in another direction.
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Author: Mrs.Neal
This blog will be written by the explorers of The Discovery Den. Look hear for pictures and info about what's going on in the Den.. Archives
February 2017
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