Here's the link to practice:
Sheppard Software_
Make sure you are studying for your test THIS FRIDAY. It covers all 50 states.
Here's the link to practice: Sheppard Software_
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Reflection is when light bounces back. Shiny, smooth and/or bright things reflect the most light. Examples of good reflectors are: mirrors, water, aluminum foil, metal objects, shiny surfaces, smooth surfaces. Refraction is when light bends. When light travels through a different medium, it bends, or slightly changes direction because it travels at different speeds between each medium. Examples of refraction are: rainbows formed from white light hitting water vapor (acting like prisms), hand lenses, glasses, eyeball lens, prisms, curved class (glass bottles), liquid There are concave and convex lenses. A convex lens bulges out. When light enters, it then bend and converges on the other side, then spreading out, causing the image to appear larger. An example of a convex lens is a magnifying glass. Concave lenses are caved in. Light travels through, bending and spreading out instantly, causing images to appear closer up. An example of a concave lens is a peep hole. REFRACTION IN REAL LIFE:
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 |
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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