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Kinematics - Pre AP Physics - Crash Course Physics #1

Added Oct 05, 2019 •

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Some basic information regarding 1 - D motion and the kinematic equations. Pre AP Physics level

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hi I'm don't touch anything Mara and I hate you want to learn physics I have to say good choice is a signs of how the world really the whole universe things tend to move around alot of motion why you move it through the wild why is that why well for one thing the police is physics to decide to break the Lord understands even know enough to dispute it you have tonight motion to do that you need to understand a few essential conditions that describe your physical place in the universe conditions like time position velocity acceleration set to talk about these things you'll need a set of equations that links together which just might help you beat that speeding ticket what's in a driving on a straight stretch of highway say some taste nice and flat on the White spices of the Northern Plains of the United States a North Dakota you stop because you're a good driver and the light turns green 7 seconds later you hear the sirens and see the flashing lights of a police car for the ticket for speeding in a hundred kilometers an hour because the speedometer car is broken so you need to find another way to figure out how to stop by talking about how you call with moving dimensional motion because the car is back and forth I'm not lying difference from something that's free to move in all three dimensions instead of describing animation just in time to speed up like a police officer or other nonsense is mighty we physicists describe its time position velocity and acceleration time simply tells you how position is also important to know where you are and where you are it can even be negative face forward or backward east or west the change of position then it's displacement is positive you'll know you've made in one of those directions if it's negative you're traveling the other way which direction is positive and which is negative geometry you can decide the issue be positive negative or the other way around in the same thing you just have to make sure to keep track of which direction is positive and keep that in mind when you're talking about velocity and acceleration to Velocity is the way your position changes over time is Jose a pretty big deal kind of like speed but just like the displacement it will be moving in a positive or negative. The full quantity of listen to in the car when someone Slams on the gas stop your velocity is changing these different conditions that describe the movement of you do the Pains of North Dakota generally presented his position versus time with Pizzazz Optical axis and time on the horizontal axis and time is T you just stayed in one spot say at 4 meters from the light 3 seconds didn't stop but instead send a line would be diagonal to show how your position was changing like this and the third time that's how you were standing still at first but then you hit the gas and you moved in such a way that the one second you went one meter in the closet directions to T seconds you went full micha's and also sweet that can you go online me to send that case you end up like that just so positioned in time you also have to be how to graph your velocity and acceleration is measured in meters per second Federation is quite similar acceleration hey goes on the bus school and time goes on the horizontal acceleration is measured as the change in meters per second is units of meters per second per second to meters per sec the time position velocity and acceleration relate to each other velocity of the change in position of a time and acceleration is the change in velocity of a time she will be different from moment to moment when you hit the gas average velocity for a second. Sorry for those last three seconds we have to do is take the change in position and divided by the change in time out how much something is changing just means that you have to volume is final value since is physicist will end up doing that a lot we privyet that difference using the lowercase Greek letter Delta so we can use that to write the equation for average velocity is just Delta ask the delta-t the change in position over the change in time when you had your foot on the gas and smog change in position with Delta X what is 13 - 409 Mi east of 0 seconds and ended up 3 seconds meaning that you're delta-t was 3 seconds / 3 seconds you moved. 3 meters per second describe average acceleration is the average velocity of the change in velocity divided by the change in time and his something is incredibly handy constant acceleration that is acceleration that takes place at a constant rate we can rearrange this equation steps equals Viet * 0 + 80. According to Velocity at Time Zero productive acceleration times time this my father this is this is an equation will be using a lot so he could have a definition of acceleration because that's exactly what it is it's saying that constant acceleration is equal to the change in velocity divided by the change in time is algebra 2 me the variables around different kinds of acceleration ones that don't involve speeding tickets right at 9.81 meters per second squared which physics is often abbreviated as lowercase G it will be using only links velocity celebration in time what about position that's an equation for that to the second key to my skip question which will cool the displacement cut because it takes her acceleration is starting but I'll see and how long you looking for and uses that information to figure out boy displacement was on the displacement curve equation to make sense if you think about it and then there should be some way to link them together what beats. Even you need to know the fast to the definition of acceleration and the displacement cup different ways of rearranging these men to have so many times and cumin you can use them together really for example if you know your acceleration and you'll start seeing and final velocities you could use the definition of acceleration to figure out how much time you were traveling for then you could put the time into the displacement curve equation and use it to find your displacement I know your initial velocity V note with zero 20 with 7 Seconds to find is your acceleration which we can get using the displacement cup parking in everything we know we find that you're a federation a second Squad and we can plug go to that into the definition of how to find final velocity like that we learned that you were going 35 meters per second when the cops pulled you over that's 126 km an hour sorry in this very first episode of Crash Course physics what about position velocity and acceleration about the two main kinematic equations the definition of acceleration on a displacement curve crash course physics is produced in association with PBS digital Studios you can head the channel to check out amazing shows like dickler the good stuff and PBS space-time this episode of Crash Course was going to the doctor Cheryl see Candy Crush cool studio with the help of these amazing people have a Graphic team is Dog Cafe

Uploaded by Shawn Mize.

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Kinematics - Pre AP Physics - Crash Course Physics #1

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