Micro Presentation on Acceleration

We talked about the topics of speed distance position and displacement. Like we talked about the formula for calculating. Maybe there's going to be distance divided by time, which we can find easily. Whether we're driving a car running any of that sort of thing. So a more kind of advanced management will use an everyday life, whether you're driving the car, whether you're sports, whatever is going to be acceleration rate. So acceleration is just how quickly your changing velocity or speed in a given time. So who can name the points in life in the real world scenario where we will use acceleration? So you know a lot of manufacturers have things like this core do zero to 60 in 70 seconds as big with four models like Lamborghini Lamborghini for those kinds of things. This one will use it in real world scenarios, as we're athletes, that's going to be our first step that's the difference between being fast and being quick is accelerating. So as we have up here, acceleration, that's going to be our final speed minus our start speed and then this T is going to be to get a top frame. And so the formal definition is going to be the rate at which your speed or your velocity changes. So again, all it is is B finished modesty store. Once you get that total, then we're going to subtract it by the time. So for instance, if my final speed in that zero to 60 is obviously 60 miles an hour, I start zero and it takes me three seconds. We know the dark acceleration rate is going to be 20 miles an hour per second. Movement of real quickly. So based on this definition, rate at which your speed changes can be positive or negative. Positive. So it can actually be positive negative four equal. So think about when you're driving and you're hitting the brakes. When you hit the brakes, you're decelerating, which all is means is my finishing speed is lower than my starting speed. So that's deceleration or a negative acceleration. And then our unit is going to be meters per second squared. But here in the U.S., we use miles per hour, we don't use the metric system. So you'll hear off hour per second. So these are just examples that's going to be a time graph. As you can see, this person on the left is accelerating slower than the person on the right. The reason we can tell that, so we have time. So two minus one is going to be one, two minus one to one. So that's 1 m/s squared. We know that from the time difference in the speed difference here. On this two minus ones one, but four minus two is like two. So what's greater than one divided by one or two puzzle? So good. So this person on the right moving downhill is accelerating twice as fast as the person. So graphing acceleration acceleration calls into the line of the slope up on a speed versus time graph, the steeper, the hill, the greater the acceleration. So we talked about deceleration and hitting the brakes on the car. So while this is certainly proof of accelerating, what were the deceleration graphs look like? Good. Because like we talked about that would show our start time as our start velocity is higher than our finishing velocity. So question for the class. Which one just by looking at this graph, we know that the units of the same paragraph. So if we have one graph, who has a very steep angle going from left to right, and one with a slightly more flat, more parallel line to the axis, which one is going to be accelerating at a higher rate. Good. One goes deeper. This is how we can easily tell these by just look at them without doing four calculations. But we calculate this, it will back up our theory of that's the one accelerating faster. So what does the acceleration of the graph? So think about, I know all who use it as cruise control. So when they're on the interstate cruise control, how much does your speed vary in the next. That's the same thing this constant speed graph is showing. So our acceleration is actually going to equal zero. So if I'm going 60 miles an hour, 4 o'clock and I'm going 60 miles an hour at 5 o'clock. All we have to do is subtract each and we're going to have zero on the top of that equation. So it doesn't matter what our time is. Because those two cancel out, it won't be zero synthetic acceleration. Now, obviously, when you're on the S 8 or whatever, you're going to have rights, those kinds of things, but are overall average acceleration, and that's what that's going to be. We have zero acceleration at constant speed because the speed does not change. Does anybody need more time to get this out? So V and a practice problems. So an acceleration of 20 km/h per second pays for the speed and increase by 20 kilometers. An hour for a second. So the similar to the miles per hour we use, just relating it to us again in America. They get this is just a visual representation for anybody to see. We get that change in speed. That's a V star minus B finish, the 5 seconds is our time. So 100 divided by zero divided by 5. That's how we get the 28 km/h per second. Okay? Has anybody confused about anything up to this point? Then we need to clarify. So tax problem moves is moving at 1 m/s. After three seconds, it's final speed, it is 4 m/s. So calculate this, and then when you have the answer raise your hand, we'll go over. Anybody have to answer. I got one. So we are accelerating at 1 m/s. Squared. So we talked about earlier that the unit is meters per second squared. Why is that the case? So why we talked about yesterday, our unit force speed in the metric system is generally going to be meter per sex, or is it a meter per second squared? And we're increasing our rate of speed, 1 m/s, everything. So meter per second per second, just second squared. Again, here we go. V two minus V one, divided by T, so four minus one equals 3 m/s. We thought about 30 seconds. That's one liter per second squared. Good job. So we talked about we have negative acceleration, which is going to be deceleration positive acceleration just acceleration. And then constant speed, which is zero acceleration. So negative acceleration we're still going to subtract the starting point from the finishing point by the starting point of the divide by the time. And we can tell this on the graph because it's going to slow down or when we calculate it out. We're going to end up with a negative number. So that's very easy to remember is my answer is negative. That just means negative acceleration or deceleration or come out with positive number, obviously if that's going to be positive acceleration. So then which one of these is going to be negative acceleration? No, so this is actually going to be positive acceleration. So think about a plane taken off. We started this close to constant speed. The closer we get to the end of the runway, the more speed we pick up and think about this as it takes all forward going into there. And so this is going to be negative acceleration because think about we talked about first control auto molecule, this is when we get to our cruising altitude of 30,000 feet or whatever. And then they just put the coast on and then we start flatlining. Any questions, confusions about that? So freefall. An object is accelerating due to the force of gravity and no other forces acting on it. So does anybody ever notice before? So when you go skydiving until you pull the parachute, you pretty much just fall out of the plane that goes out there and takes you off when you're scratching your complete freefall because you accelerate it not .8 meters per second squared. So every second you're falling down, you're picking up that much speed. What is something unique about the rate of acceleration due to freefall? It's because of this constant so it's going to we're going to be celebrating the same each second, but when what did you say? Yeah, so that just equals the force of gravity on earth. So that's why Isaac Newton he did all these tests with free falling objects and he found it from the same height. All these different objects will fall the same time. So bob, the foam ball, the blades, one ounce versus a bond bold, which 13 pounds. They're going to fall into the exact same way. Because gravity works on the site. Now, the only time we get into things that will interfere with this is when we get into the same aircraft name, which is aerodynamics, those kind of things because it's creating more liver systems. Okay. So projectile. Why not something else worse than yours to think about when I'm throwing ball shooting ball or kicking the ball? What's its initial movement? And so if I throw some Santa on somebody out from the outfield, then I throw a ball up. The force of gravity is going to break it down. But because it had this acceleration behind it, it's not a freefall. Because we have two different forces active part. So again, the formal definition of projectile moves from the force applied to it, and under the effect of the acceleration through the value. So if we talk about earlier, a freefall there is air resistance. This is going to decrease speed and decrease acceleration. It depends on the surface area of an object. So think about all. These so for instance, to improve this deal, I'm going to draw this ball in this piece of paper, the exact same time. So as we can see, this piece of paper covers a lot more surface area than this bowl. So we draw them, that's the difference. That surface area creates is what accounts for that difference component as it's falling through the ground. So if we put these things in here for a vacuum that's had all the air selected out of it, then there will be no air resistance those two will meet at the same time. But in real world scenarios, that surface area is captured at different, and acceleration all the way down to two to three fold. Does anybody need any more time to run? Because. All right, so that's the end of the project for the end of the month. So wrapping this up, I want to go to think about and give me an example of Tom Jones acceleration in your own life. So we talked about running down the millisecond to work. That acceleration is that first step is key in sports where the football baseball basketball, whatever. What's one more example of when I'm at linebacker. And I like when I'm going from running back to my discovery that different species. So your ability to accelerate determines your ability to get to that gap and be able to stop that color right there, or if you're too slowly against bike. So good job. So we will have a live tomorrow we're doing a paper airplane lab where we will calculate the time and distance. We throw these airplanes and then we'll calculate our speed of each airplane based on that. So