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Carmen Harper
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Forms of Energy Notes
Added Jan 07, 2019
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So today we're going to be talking about energy now just like matter cannot be created or destroyed but simply rearrange the same thing goes with that are the amount of energy in the universe is called we can't magically create energy we can magically make energy disappear but we can make energy change forms so what are those forms and how did they change that's what we're going to talk about today has anyone ever told you that the light bulbs in your house of Howard by energy from the wind or cold or maybe that's diesel the same kinds of energy what do we mean when we say energy something has energy when it said the doing stuff or it has the potential to do stuff that's pretty let's look at a few examples all right it's me getting strapped into the world's largest swing it's located in New Zealand the country where I grew up I'm hanging upside down platform above a big Valley the ropes I connected to a cable in the middle like this now you can guess what happens when they let me go right it takes a lot of energy to move something that fast but where is the energy coming from or here at the top I have what is called tationil potential energy I'm located above the Earth which has a strong gravitational pull on me I have the potential to move and hasn't let go I stop moving and the gravitational potential energy changes into cold kinetic energy anything that's moving has kinetic energy the faster I go the more kinetic energy I have slowed down she is change back into gravitational potential energy now I know what you're thinking is energy can just change back and forth like that wouldn't I just keep swinging forever all your food how nosy it was right losing some of that energy as Sound Energy of another kind of kinetic energy I'm also making a little bit of heat by friction with the air it's by changing one form of energy into another like this that we can make useful things happen. Let's go back to the examples from the stock power of homes with electricity and let's say that it comes from the wind the wind spins a turbine like this one it has kinetic energy a generated inside the turbine changes that kinetic energy into electrical potential energy that is transferred down power lines to a what is that energy came from coal or when you burn called there's a chemical reaction between oxygen in the air and the coal that creates carbon dioxide and other chemicals the creation of these releases energy is heat which we used to boil some water which sensitive like the wind energy is coming from a chemical reaction we say that the coal is chemical potential energy similar thing happens when you eat food when your body breaks down that food chemical reactions occur that keep your body warm and allow your muscles to move you change the chemical potential energy in the food it's a heat energy and kinetic energy one important thing to know you can only change it from one form into another in the entire universe has been there since the beginning of time it's just constantly getting changed let's review energy is either doing stuff schedule to do stuff with disgust gravitational potential energy in the swing electrical potential energy like in power lines and chemical potential energy in the food that we eat there all the kinds of potential energy elastic can you clear but they're quite similar to these ones with disgust kinetic energy which is where things are moving with also mentioned heat energy temperature is just the movement Allsup's something gets Hossa the actions inside its. So he can be swallowed is another kind of Connecticut so we can actually simplify that he is once something has when it is moving or when it has the potential to move that is energy okay just relax and keep your eye on the target that was supposed in last time Tim and Moby what is energy energy is what makes matter move or change its the ability to do work has potential or stored energy release stored energy will be released his motion the potential energy will transfer to the arrow has kinetic energy well the photos work on the Arrow when you release it and you know it does work on the target when it hits here she comes in a bunch of different forms are you stored in food that your body uses to power plants in batteries provide us with electrical energy the sun is our major source of light energy wind moving water airplanes and sound has mechanical energy vibrating atoms cause heat and that makes thermal energy nuclear energy is released from inside atoms when they are broken apart or fused together you're becoming a pro at this no way there's no way I'm letting you shoot this apple off my head
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Carmen Harper
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