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Video Lesson - Kinetic Energy and Potential Energy 04 03 + Quick Quiz

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Hi, everybody! A quick hit 15 minute lesson about Kinetic Energy (KE) and Potential Energy (PE). Make sure you watch this video before clicking on the link below. It will lead you to a self grading quiz, and you'll get your results right away. https://drive.google.com/open?id=15aDe18rBPSY7DFSCcZfbscX-BM_aPFKfuMtICkEi2uk

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good morning saying 6 today is Friday and I've prepared a little video review for you of the kinetic energy and potential energy lesson we've got over it many times but we're about to get on things that involve use of these words on regular basis we talked about creation of the solar system which one the matter energy and matter what we talked about everything in science going to be either energy or matter that's what the Formula E equals MC square base energy equals mass times the speed of light squared that relationship means that those dates of the universe what we calls FaceTime are connected very strong ways and in order to discuss it we have to understand it so we're going to talk now about kinetic energy kinetic energy is defined as the energy of motion an object is in motion it has kinetic energy kind of got to know that the amount of kinetic energy an object has is related to its mass and its speed in other words I'm much of something there is and how fast it's moving determines how much energy there is that relationship is part of the equation and we'll talk about it later kinetic energy equals one half times the mass of an object change the amount of energy the amount of velocity something has Square supposed a bowling ball has a mass of 6.5 kg and a marble has a mass of 6 gram if they're rolling at the same speed exact same speed the bigger thing has more energy it's harder to push it and if she needs to work right so if we pushing it we feel the diff it's between the energy needed those two things at the same speed suppose three Vehicles driving down a straight highway or at the same speed one of them is going to handle smart right over here you can see it the Smart car has the least Mass the school bus has the most Mass which one has the most energy the school bus that's why it's bad to get hit in the end you see the same TV sometimes when they do this all the time when somebody's going to be in a car accident they never showed them getting hit by a car the same side right if you want to stop how do you use a garbage truck or an 18-wheeler something right that's why more mass more energy very simple very straightforward right and very quickly going through the practice questions yay Study Island the diagram shows several points along the path of the roller coaster car as it travels on a track at the top is a starting point where is the most kinetic energy while the mass doesn't change right the mass stays the same unless you throw up that would mean you have less mass by I'm get to the bottom so from point A to point B assuming you haven't thrown up you have more velocity more velocity more kinetic energy Erica yeah I get the crabby guy okay next question drag each tile to the correct box the lowest kinetic energy thank you this kid he's like a human smart car right so he's the lowest kinetic energy so Koji Shiro Amigos okay well they actually put some in the order which is I have been a silly but okay Peru is correct oh they're the same Ichiro has a higher speed so me too Andrea and the other members of the tennis team are hitting tennis balls if two people hit Pinnacle balls of same time which ball has the most energy kinetic energy relies on to things mass and velocity so distance doesn't measure at all okay how long something is moving does it matter breakdancer going to be be and crabby geyser the picture shows John Mark and Erica on an elevator the elevator is moving down from the 10th floor of the building to the first floor of a building Judge Mathis 78 March Madness is 31 Eric is is 54 never remember kilograms measures mass not weight what's the measurement of weight in the metric system answer this one if you paid attention in the comments section yesterday that it would be Newton now at any given moment which of the following statements is true Mark has the most kinetic energy and John has the least kinetic energy is that true mark is the covid at the answers mark who is the little kid does not have the most kinetic energy clearly the person with the most Mass has the most kinetic energy means John has most kinetic energy the correct answer is C now once we get the crabs walk across the screen this gives me a chance to answer one of the questions that they covered on MythBusters if your elevator is falling so if John Mark and Erica are plummeting ground word because the brakes have failed and the cable snapped and they jump up right before it crashes introduce their injury will know because the kinetic energy they're moving at depends on what two things there Mass witch in her case is 54 and her speed and her speed is we dictated by how fast they're falling she jumps up just a little bit you still almost falling at the exact same speed maybe a little bit different so know they're all going to make go to the hospital after the elevator car lamps now we're going to move on he's me to the potential energy lesson and discuss that briefly potential energy NOW essential energy is defined as stored energy energy can be stored by you work against a force okay our whole world runs basically on electricity and gravity okay if we didn't have gravitational potential energy every time we have to mail it to the grant or happy time we plug something in nothing would happen we need that electrical potential energy Ford in the socket where we put in the light bulb or in a battery so potential energy is just as important is kinetic energy it's just as a media sometimes so looking I'm here you'll see the first one they talk about is gravitational potential energy in other words the higher something is the more room there is for it for Gravity to affect it an object's gravitational potential energy is directly proportional to mass height and the acceleration due to gravity directly proportional needs X okay for potential energy gravitational potential energy is usually expressed as a formula MGH Mass height and acceleration due to gravity I don't get that when two objects masses are equal the higher what has the most gravitational potential energy what makes sense right looking at this these two guys have equal gravitational potential energy however when the guy the white shirt Chelsea's friend the guy who's attached to the bungee cord off the side of that cage the guy in the dark clothes is going to have a higher kinetic energy now magnetic objects have to pause and you know this right maybe they draw magnet that got one side red one side blue one side and one side ask North and South same as the Earth although the place keeps changing the magnetic poles are actual physical places you can go to right now I think magnetic poles in Canada but it's on his way to Russia does the Earth's magnetic field is Shifting now when it does that all the compasses are going to have to change all the magnetically controlled compasses is compasses point to the magnetic poles not to the geographic poles so as the magnetic pole changes say the well let's say this year is where the Magnetic North Pole is right now my finger is always going to Point North well if it does this and then the magnetic pole moves to my other ear it's going to be close to the same thing right but not exactly right here if it's pointing towards that here I'm trying to go here you see the difference right so is the Earth's magnetic field changes Direction compasses Point change magnetic objects have two poles if you look at the drawing you've got North and South got north and south and they're sorry those are both north over there let's do that again Take 2 you looked over here you see the magnets have a north and a South magnetic potential energy is greatest when two objects are closest together or when I have magnetic field is and that just makes sense right magnetic potential energy is a measurement of the strength of the magnetic fields ability to move something that's magnetic they demonstrated this in class if we put those little chunks of iron iron filings near a magnet you can see where the magnetic field is physically it moves items so magnetic field demonstrates where the magnetic potential energy is electrical potential energy we talked about magnetic potential energy having a north and a South if you look over there you can see that Alexa potential energy as a similar thing it's got a plus and a minus and remember I said the other lesson the gravity is one of the four primary forces electrical energy the relative positions of charges in an electric field act similarly to gravity in that it's an invisible force that acts at a distance electric potential energy is greatest when the which objects are close together or Brookfield is the strongest makes sense right any questions in the comments below or hit me up during office hours between 10 and 12 Monday Wednesday and Friday and then the last one that they have on this page is called elastic potential energy and that is an excellent demonstration anything that in a cartoon was go that's elastic potential energy of a spring rubber band a guy's face when he's being punched real quick let's look at this okay now this guy's face okay you know that when he gets punched this way his glasses okay we gets punched this way his glasses are going to go flying that way that's kinetic energy and you see that the shape of his face is changed because of the Fist punching it that means that his face at all like this but you know that his muscles are going to stretch and his face is going to like that in the other direction that's because of the elastic potential energy being demonstrated by his face that's it for this lesson remember in the description on my teacher webpage there's a 4 question quiz related to all the things that we just talked about make sure you do it it's how I'm taking attendance it's how I determine if my lessons actually refreshing your memory that anything thank you so much for listening I will see you next time

Uploaded by Denis Valyo.

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Video Lesson - Kinetic Energy and Potential Energy 04 03 + Quick Quiz

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