Hi, It’s, Mr Andersen, and today I’m, going to talk about potential and kinetic energy. Remember from the last podcast that intensity is the ability to do work And work is a force occasions times the length. So we assess use and intensity, both in joules Now there a ordinance of the conservation of energy, In other messages, that ordinance states that force can neither be created nor destroyed. Now well transformed into mass distributed according to E mc2, But we’ll get to that lastminute, And so, since energy can neither be created nor destroyed, well proselytized, And so the two terms that we generally talk about when we talk about storing or Using energy are potential and kinetic energy. Now I’m talking about possible gravitational intensity and kinetic energy, And so we also have possible vitality, for example, in the chemical bonds of a molecule. But I’m not talking about that And so the two types of energy that we have are potential energy And that’s energy due to position And kinetic energy And that’s energy due to motion. And “were having” equations for each of these Potential energy is mgh. Where m is mass g is gravitational, acceleration and h is the height, And then kinetic energy is one half mv squared where m is mass and v is the velocity of the object. Now the best place to look at how force is converted from possible to kinetic energy is in a pendulum. A pendulum is simply a weight attached to a string, And so, if I support a pendulum at one side and don’t, let it go, it has a certain amount of potential energy. When I let it go, the pendulum will swing backward and forward. That vitality is converted from potential to kinetic and then back to potential vigor And then to kinetic and then possible over and over and over again, And so when that ball is sitting at the top, it has all possible vigor When it’s at the bottom. It’s altered all of that intensity into force of action, And so when it’s half way down, we would say that it has a combination of potential and kinetic energy And it’s just proselytized Now will a pendulum swing forever? No Because we’re going to lose a little bit of that intensity in friction in heat in sound as it moves, And so eventually that pendulum is going to come to a stop, And so let’s do a couple of problems with potential energy and Kinetic intensity Potential energy recollect is measured as mgh, where m is, mass g is gravitational, acceleration and h is height, And so let’s say, for example, that I clambered to the top of a ten legend structure And so, first of all, we have to know My mass, which is 78 kilograms. We have to know the acceleration due to gravity or g, which is 9 81 meters per second squared, And then we have to convert that ten fib building into rhythms And so a ten tale building is roughly 32 metres high or that’s, our h price And So if we simply multiply those all together, we get 24 485 76 joules. And if we do significant toes that’s 2 4 x, 10 4 joules of energy, that my torso has at the top of a building. And as long as I stay at the top of that build, I can use that on the way down. I don’t want to jump off the top, because I don’t think I would be able to make it. The next type of energy is called kinetic. Energy Energy of kinetics or action is 1 2mv, 2 And so that’s energy due to motion And if I mounted off a ten narration construct, I would proselytize all of that into kinetic energy at the bottom of my tumble. But I don’t want to do that And so let’s do one dealing with a baseball. Let’s say I pitch a baseball And there are two different tones. When I throw a baseball, I probably propel it around 20 km / hour. If I were to throw it, I’m not a very good thrower, But a really good major league pitcher will hurl it at 100 km / hour, And so let’s figure out how much kinetic energy would be in one of my throws and then Those of a pitcher in the major league. First of all, we have to figure out the mass of the baseball. The mass of a baseball is 0 145 kilograms And since we’re doing kinetic energy, the only other ethic that we need is the fast. And so, if you propel a 20 mile per hour lurch that’s, approximately 9 0 rhythms per second Remember on all of these, we ever have to convert it to rhythms or rhythms per second excuse me: it if’s a velocity A 100 mile per Hour pitch, then, is approximately 45 rhythms per second, And so, first of all, let’s figure out how much kinetic energy my slope would have A 20 mile per hour tone. We use the equation: 1. 2Mv 2, where m is 0 145 kilograms and v is 9 0 rhythms per second. We then take that times: 1 2 and square the velocity and I get abusing significant toes 5 9 joules of energy. Now let’s try the faster pitch It.’s. 100 km / hour, so that is 45 rhythms per second, So we’re going to use 1 2mv 2. Our mass remains the same or it’s, 0 145 kilograms, Except our velocity now is 45 rhythms per second. If I multiply that across exercising significant digits, I get 150 joules of energy Again when I pitched it 20 miles per hour. It was simply 5 9 joules, And so even if they are that pitcher is throwing it five times as fast, he’s get approximately 25 times. The extent of energy out of that degree And that’s. Why? If you look at the equation, the velocity being squared is super important understood that, And so you can solve complex problems now that you know the equation for possible vigour and kinetic energy, For example, in class, we figured out based on the speed of a sprinter And the mass of the sprinter, you should be able to figure out how highpitched they could pole vault. If all of that kinetic energy were transformed into possible vigor at the height of that twilight, But that’s it That’s. In summary, again the ways that we can measure energy in joules And it’s the ability to do work And remember it’s always proselytized from potential or vitality due to position to exertion of motion or kinetic energy. I hope that’s supportive.
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