2D Motion - Physics 101 / AP Physics 1 Review with Dianna Cowern

Рет қаралды 110,149

3 жыл бұрын

Lesson 3 (2D Motion & Kinematics) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you!
Exercises in this video:
Problem 1
You’re jumping off a 10m high cliff with an initial horizontal velocity of 2m/s. Some rocks extend 1m out at the base of the cliff. Will you clear the rocks? By how much?
Problem 2
Kick a ball at a speed of 20m/s at an angle 37º above the ground.
a. How long is the ball in the air?
b. How far away is the ball when it lands?
c. How high did the ball go?
Problem 3
Juliet throws an egg at Romeo’s window. The bottom of the window starts 6m above the ground, and the window itself is 1m tall. The egg leaves Juliet’s hand 1 m above the ground, traveling 30m/s at an angle of 60º with respect to the ground. Does she hit the window?
Executive Producer/ Host/ Writer: Dianna Cowern
Lead Writer & Course Designer: Jeff Brock
Producer: Laura Chernikoff
Video Editor: Spenser Reich
Researcher/Editor: Sophia Chen
Videographer: Levi Butner
Production Assistant: Hope Butner
Set Design: Lauren Ivy
Curriculum Consultants Lucy Brock & Samantha Ward
Consulting Producer: Vanessa Hill
Curriculum Consultant: Andy Brown
Skate Videographer: Darren Dyk
Consultant: Kyle Kitzmiller
Illustrator: Aleeza McCant
Transcription: Alicia Cowern & Cathy Cowern

Пікірлер: 473

@mellowmatt2103 3 жыл бұрын

She went from exploring physics to teaching us physics⚛️

@nffology_ 3 жыл бұрын

Yep

@ViiKing_ 3 жыл бұрын

Well, when you're taught enough, the only way to continue learning is to make others learn

@mellowmatt2103 3 жыл бұрын

@@ViiKing_ wow ,you have spoken magical words here.

@williamclaflin7863 3 жыл бұрын

Shes exposing as much as she can to young ones before you require more help. Bravo I luv dr.c

@rache2670 3 жыл бұрын

@PhilipGreenShow 3 жыл бұрын

Your superhero costume had me in stitches! Loved the diver explanation x

@ravijangrax 3 жыл бұрын

3:37 Tom and Jerry always uses option Two .😂😂😂

@raymondneilbarajan 3 жыл бұрын

16:59 The final answer is correct but I think the 10 m/s^2 should have a negative sign for clarification because it is a downward force. Love your content btw. You're making Physics look fun!

@Wild_Bill57 3 жыл бұрын

I’m enough of a physics geek that I already understand what you’re covering but enjoy the way you teach it enough to watch it again. You do a great job!

@bennybooboobear3940 3 жыл бұрын

This series is so underrated! It seems so simple and like “I already know this”, but it’s not! You learn so much!

@w.a.v.e 3 жыл бұрын

Great video from a retired physics teacher. Small correction at 17:00 where acceleration should be “negative “ -10 m/s/s. You got the right answer though. 😎 Keep making these videos.

@chickenonwaffles106 3 жыл бұрын

Perfect timing, my exams tomorrow

@astrophiledevansh898 3 жыл бұрын

Literally my too and that also physics exam and this same topic

@ajaykumarupadhyay5863 3 жыл бұрын

Brother in which class are you

@Roberto-REME 3 жыл бұрын

Great video Dianna. You make the logic fun and the math as well. You have a great presence and narration.

@aliceg5327 3 жыл бұрын

Dianna's face introducing KK! 😂😂 SAME, GIRL ! Also. Thank you for these. I'm not studying for anything. I'm 33 and I studied business, so it was left behind pretty early on. But it's just so cool, I got into it later in life (through space as a gateway, let's be real.). It's always fascinating to follow your videos and, simply to know what a ballistics expert would have to do in a conversation about a new model of airplane is a bonus for everyday life. 😍💜 Thank you!

@aliceg5327 3 жыл бұрын

@@GrodyMaroon hey! That's awesome! Good for you! I actually did a switch also, but I headed towards programming. I keep learning about physics and history for fun (there are no exams, I love that about it). But it's proven useful many times, and sometimes ends up in a story I write. 🤷‍♀️

@John.0z 3 жыл бұрын

You are having far too much fun doing these educational videos! I love them.

@ivaminic1437 3 жыл бұрын

I lovee this series, it's refreshing my memory for physics. Thankk u ☺💕💕

@johncage5368 3 жыл бұрын

16:57 Gravity pulls down, not up, in this scenario, so the acceleration part gets a minus. Result is about 7.58, so you calculated this correctly (if we ignore rounding ;)) before and just got the sign wrong.

@gene9230 3 жыл бұрын

it is the problem, if you do not define the coordinate system, as the first step

@msudawg1997 3 жыл бұрын

I just watched the video and posted same comment. It's an important point and a shame she missed it in the explanation.

@alfamaize 3 жыл бұрын

Instead of pointing out that a = -10, since up is positive, I'll just reply to this one who already pointed out. In my class, you would get one point off for getting the sign wrong. But you knew the answer...

@msudawg1997 3 жыл бұрын

@@michaelspurlock9575 because the 10m/s she used for gravity needs to be a negative number.

@msudawg1997 3 жыл бұрын

@@michaelspurlock9575 1+ 26*(4/15)+(.5*(-10)*(4/15)^2)=7.58

@Micetticat 3 жыл бұрын

I like that "change of perspective" analogy to illustrate the two independent components of motion!

@martingibson8273 3 жыл бұрын

Loving the new video digs Diana.. gr8 job. Looks fun and your having a blast!!

@user-ye8nb9nm6t 3 жыл бұрын

I'm really enjoying this series! Thanks!

@iampuzzleman282 3 жыл бұрын

How wonderful to wake up with physics, and Dianna!!!

@rickseiden1 3 жыл бұрын

2:01 "And back to normal." I thought I was watching Physics Girl. (I love your show, and you are one of my absolute favorite KZfaq people!)

@LukaszSebastian 3 жыл бұрын

This reminded me of one of the problems we had to solve on my first year of physics at the university: what is a trajectory of a ladybug waking (with a velocity constant in her reference frame) along a radius of vinyl spinning (with a constant angular velocity) on a gramophone

@stowphysics 3 жыл бұрын

Thanks for the videos. always good to have more examples and content. Be advised that I gave my AP students a test over this today. Most teachers try to keep a pace so that there will be time to review at the end of the year, so your're a little behind the pace that would be most helpful to many. Also, keep in mind sometimes teachers put electrostatics in the middle of the year so that the dry air in the winter makes for better demonstrations.

@MechE_Emma 3 жыл бұрын

Thank you so much for teaching me physics better than my own physics instructor! I was just cheering because this finally makes sense!

@abdulrahmanaljohani1892 3 жыл бұрын

You’re amazing , thank you for this video please keep going.

@srikarraoboinepalli3216 10 ай бұрын

you are alive Dianna ...thank you Gpd🪷

@Nurse_Lucy 3 жыл бұрын

I wish this was available when I was in high school

@k.harishmurugan4214 3 жыл бұрын

At 17:00 the correct formula is Y= 1 + 26*(4/15)-(1/2)*10*(4/15)^2 Acceleration due to gravity is minus

@monkey.d.luffy_017 3 жыл бұрын

Best physics teacher in the world love ur work dianna will look forward for more

@timeverse1545 3 жыл бұрын

“ We gonna need one new tool for these problems “ - pulls out a paper 🧻

@SonuSharma-hb1ox 3 жыл бұрын

Both fall down at the same time as you say sideway motion is independent of up and down motion you have a good teaching way

@herambpatilofficial 3 жыл бұрын

I love the way you teach!!!!! 1:52 Both will fall down at the same time, Because even though you fire it with some energy, it looks like you're firing it up horizontally, so, the forces acting on the hair ties in a vertical direction are the same! I have a small request for you, when you are making this video, do look the syllabi of the Indian CBSE board, many people are interested in such hands-on learning, I find your videos quite similar to that of Professor Walter Lewin's videos. Please do that!!!

@mr.random3756 3 жыл бұрын

I really really really love the way you teach us😍😍

@llaauuddrruupp 3 жыл бұрын

Yes! More of these 'tutor' videos :-) I love them!

@CellRus 3 жыл бұрын

I remember when I used to study this in highschool and didn't really understand the intuition of all the calculations I was doing, that made studying physics was quite challenging for me. But now almost a decade later, I'm no longer in the physics field (but a cell biologist), I really enjoyed reworking these problems on here and Diana really does make me understand these concepts so much better and so much more intuitive. I wish my highschool teachers would focus on making the problems intuitive rather than just dumping tons of complicated problems and made us remember all the equations without really understanding them. If they did it, I might just be in physics now.

@siddharthas3692 3 жыл бұрын

Amaazing Diana! Keep making these videos. 🤩

@pkraja8723 3 жыл бұрын

who has an innovative idea to define OUT TAKES...? *cough* OUCH TAKES

@ap1jpanimations920 3 жыл бұрын

You're the teacher I always wanted

@osmosisjones4912 3 жыл бұрын

My idea for moving mass . say spinning panels on wheels within a a fluid with in pipes . within the walls of Shuttle

@manimaadithottam 3 жыл бұрын

Your video always inspired me to study Physics. It made me to love Physics from the times when hated physics (because of maths). Keep doing such a kind of videos and keep educating us. Love from Tamilnadu, India.

@javiergarcia2889 3 жыл бұрын

Me encanta lo qué haces!!!! Eres genial!. 👌🏻

@richarddaggett 3 жыл бұрын

Fantastic video!

@TomtheMagician21 3 жыл бұрын

I learn more physics from your channel than 3 years at school. In physics at the moment at my school we are doing things I did in year 2 but here it’s inertia and actually fun stuff

@theexplainedchannel 3 жыл бұрын

this is what I enjoy watching during covid-19 lockdown

@rinolevesquejr2914 3 жыл бұрын

thank you thank you thank you...for your trig lesson. something clicked... i had no idea so many of my problems were triangles. You helped this man's think meats

@jso6790 3 жыл бұрын

This is excellent, and I wish I knew someone taking AP Physics, so they could get the good reviews and then leave you good reviews!

@ScytheCurie 3 жыл бұрын

Not to be rude or anything, but at 16:58 it would be negative 10 meters per second squared because gravity is pulling the egg down, not positive 10

@ScytheCurie 3 жыл бұрын

@Franklin Ratliff Because gravity is accelerating us downward, not upward, it should be negative 10, not positive.

@Mouse_007 3 жыл бұрын

meters per second is speed speed is not measured in negative just because of the direction you are traveling because your car is in reverse doesn't mean you are backing up at negative meters per second. same for up and down

@ScytheCurie 3 жыл бұрын

The equation she used describes a graph in which the horizontal axis represent the passage of time, which means moving right on the graph represents moving forward in time, and the vertical axis represents height, which means moving up on the graph represents increasing altitude. The coefficient of the t² term is the acceleration being applied to the object. The object is being accelerated by gravity. Acceleration is a vector and has a direction. Gravity specifically, on Earth, pulls us "downward". Since going up and down in real life are represented by going up and down on the graph, when gravity accelerates the object downward in real life, then it goes downward on the graph too This is why it should be -10 and not 10, because gravity pulls us downward and that's what the negative sign represents. If you are still not convinced, go ahead and plug the equation into a calculator with the coefficient of the t² term being 10 and then do it again with it being -10. See what number you get both times and compare them with what Dianna got. I think you'll find that you get the same answer as her when it's -10.

@Mouse_007 3 жыл бұрын

@@ScytheCurie how does any object move negative meters per second Walt ? Up and down are only useful if your and my perspective are the same If you stand on a ladder and measure down you dont say you measured negative meters down Please explain how any object moves negative meters per second unless it is going backwards in time

@ScytheCurie 3 жыл бұрын

@@Mouse_007 Our perspectives are the same. We have the same frame of reference. We are both standing on the ground watching Juliet throw eggs at a window. That is why up and down works in this case. Not to mention, you're talking about speed which is a scalar. Velocity is a vector, which means it includes direction, and is what you should be talking about. Also, you're talking about real life. Yes, in real life, I wouldn't say I'm walking negative 2 meters per second. I'd say I'm walking 2 meters per second backward. I'd be using a velocity, I'd include the direction I'm walking. However, when we apply this to mathematics and start using graphs and numbers, the way we express direction is through positives and negatives. Also, did you actually try to input the equation into a calculator like I said? Seriously, do it. You'll find that even Dianna, the person teaching this, meant for it to be -10. She simply wrote it down wrong.

@sumitgupta6905 3 жыл бұрын

Totally loving this course. AP Physics by Diana and lockdown math by 3blue1brown are the best things to happen during this period.

@prinashah1427 3 жыл бұрын

You make physics easy n interesting ❤️❤️

@MatTheeDarkOverLordSimons 3 жыл бұрын

Thankyou PG you are my hero and fill in the gaps I am missing, much love, keep educating me please xxx

@allengillis2636 3 жыл бұрын

The Mythbusters did an amazing episode on this topic. Testing if a bullet fired with hit the ground at the same time as a bullet dropped. Now I know the math behind it. Awesome job.

@davidwilkie9551 3 жыл бұрын

Another method for determining the bottom line, away from going on the rocks. Good idea.

@praisehart7737 3 жыл бұрын

Thanks for the lesson You're awesome

@gabor6259 3 жыл бұрын

This was a good refresher.

@elierizkallah6547 3 жыл бұрын

I really love your energy and how involved you are in what you do and the happiness in work! Or what is suppose to be boring for lots of people and teachers specially! You are making it a very pleasant expirience, you are an inspiration... lots should be learning this from you, specially some modern parents 😂 Lota love physics girl thank you for doing those videos

@Echo5Mike 3 жыл бұрын

One of my favourite subjects was heat transfer and fluid flow.

@arsonor 3 жыл бұрын

Just a suggestion for future videos: consider using the formula sheet provided during the AP Physics 1 exam. Thanks for making these. If you can speed up the video release schedule at all, my classes are finishing dynamics now. We have to cover everything by December. If not, they’ll make a great review before the exam in May.

@SA.abbasi 3 жыл бұрын

Nice dianna I liked your way of explaination your brain is like a Google and you are the one from which I learn alot of topics and study physics love you lots of love ❤️💞

@MuhammadDaudkhanTV100 3 жыл бұрын

Excellent working

@muhammadhussainsarhandi9928 3 жыл бұрын

Excellent explanation,

@-_IT_- 3 жыл бұрын

You should have a TV show! Entertaining and informative!

@AhmadHassan-qx8ut 3 жыл бұрын

I love physics because of you.

@rjsmith6698 3 жыл бұрын

The skate boarder in the back of the pick up, is similar to a scenario I have thought of in the past, where you are standing on the back step of a moving fire truck and you let go of the hand rail just as the truck hits a bump in the road, propelling you upward off the step. I wondered if you would land back on the step, or if the truck would pull away leaving you to land on the road. Obviously from your demo, the motion of the truck is imparted to your body, and you would continue to move forward with the truck, thereby landing on the step. Of course if you bounced high enough, or if the truck suddenly accelerated, that might not be the case. That’s where the math comes in.👌

@AppuganeshIndia 3 жыл бұрын

Best physics teacher ❤️

@RajatKumar-ux6jg 3 жыл бұрын

I FALL IN LOVE WITH PHYSICS 👍

@Himanshu0074 3 жыл бұрын

I am a 2nd year masters student in engineering, but I'm still enjoying watching this!!!

@Gaurav_63 3 жыл бұрын

You are great teacher 😍

@SuperSingh 3 жыл бұрын

Congrats on 1.69Million Subs !

@sukuna6081 3 жыл бұрын

Very nice visualisation

@kartvyasheth2087 3 жыл бұрын

Hi I recently watched your video about fun vortexes in pool it was amazing but can you try it with other liquids.

@raulcantu6998 3 жыл бұрын

I'm already at University, and already have seen these topics, but seeing them over again is like, wow there are somethings i didn't know, for example almost at the end the parabola formula (vy/vx)(x)... and so on, was like WOW

@busterbrown17 3 жыл бұрын

I like you just the way you are you make each and every day a special day by just you being you and the best person you can be is your honest self!

@arik9112 3 жыл бұрын

I'd be over the moon if she's able finish the entire syllabus within the next year! It would be really helpful , thanks for doin this

@evanjohnson4559 3 жыл бұрын

This brings me back to related rates in AP Calc

@craigvdodge 3 жыл бұрын

Alright Dianna if you didn’t like the coffee you could have just said so…

@jigneshagrawal6597 3 жыл бұрын

Are you going to cover the thermodynamic and kinetic theory of gases as well in these lectures?

@sagnarte6074 3 жыл бұрын

Do you plan to release a video on linearizing data in this series?

@XeZeLgotdrip314 3 жыл бұрын

16:59 Shouldn't gravitational force supposed to be negative, Dianna??

@k1ng401 3 жыл бұрын

When I was about 13 years old (long time ago now) I programmed a space simulator in BASIC that simulated the gravitational forces affecting masses of different sizes in three dimensional space. I used this same technique of splitting the velocities into their horizontal, vertical and Z vectors and applying the gravitational force equation to each object, in each of the dimensions. I didn’t know about calculus then so my calculations were very rough but it worked. The small objects orbited around the big objects. Objects closer to each other in mass, orbited around a point between them etc. Because the forces were inversely proportional to the square of the distance between them, things got crazy when the masses got too close to each other and objects were flung away from each other at massive velocities so I added basic collision detection and if the objects were deemed to have collided, the program made one new mass out of the sum of the two colliding bodies.

@roldanmagnayejr.9915 3 жыл бұрын

I love you Dianna you're one of my inspiration!! Hope that I'll have a chance to meet you :(( watching from the Philippines!!

@MajorGray3 3 жыл бұрын

"... the only way to really learn physics is to work the problem" You get a like just for that statement alone. It is so true!

@subhavenkat2256 3 жыл бұрын

Yayyeee another ap physics .love you

@chaitanyadamarla05 2 жыл бұрын

Love you Diana 👍

@himanshuchauhan940 3 жыл бұрын

Ampere circuital law which is hanging behind is thinking about when my turns come to get explained by Diana in great way

@jito7921 3 жыл бұрын

Outstanding

@lord7134 3 жыл бұрын

I havent seen PhysicsGirl in so long, but now I'm here watching her vid and getting strong Bill Nye The Science Guy vibes. I love it!!

@jmco1045 3 жыл бұрын

My year before high school graduation in physics summed up in 20min... Sweet

@willythemailboy2 3 жыл бұрын

You have to ignore two factors in the challenge question. Air resistance and curvature of the earth, because if the projectile is going fast enough the vertical drop can be different. Faster still and the direction of local down will be different from that at the starting point.

@shashankchandra1068 3 жыл бұрын

Plz do a video on Lattice QCD QED

@MuhammadDaudkhanTV100 3 жыл бұрын

Fantastic

@MuhammadDaudkhanTV100 3 жыл бұрын

Good to hear

@emmagao8642 2 жыл бұрын

I think the two hairbands would touch the ground at the same time because the y motion is independent of the x motion.

@weasley313 3 жыл бұрын

so if you fire a real gun exactly horizontally without air resistance does it take the same time as just the bullet from the same hight to touch the ground ?

@alvie1974 3 жыл бұрын

So I had this question! Why are you not a professor, your joy in educating is inspirational!?! I'm a business student but I am fascinated by physics. I've taken several physics classes, and I'm very interested in continuing my physics education, eventually. In all of my classes I've never had a professor as excided to teach as you are. I think that joy would help students in a university setting greatly. However, I'm sure you impact more people on KZfaq. maybe do both? idk?! you're awesome!!!!!!!

@richard9470 3 жыл бұрын

The "360° Filp on the truck" is actually a Kickfilp ;) (The first time you compare them)

@mr.b1130 3 жыл бұрын

I was wondering if you can cover upside-down buoyancy, shaking, air pressure and frequency. I think a group in France are working on it. It seems fascinating.

@Joyexer 3 жыл бұрын

Uhm at 16:50 shouldnt it be [...] - 1/2*a*t^2 instead of +?

@karandhiman6510 3 жыл бұрын

Love your teaching, i am still watching it although i have already qualified Jee Mains (engineer exam in india).

@yes0r787 3 жыл бұрын

Congrats on your exam result.

@karandhiman6510 3 жыл бұрын

@@yes0r787thanks buddy

@youtubeisvideocloudstorage5894 3 жыл бұрын

you should do a video on all the 15 (i think) states of matter

@fulla1 3 жыл бұрын

Please use units consitant. Evertime you calcuate something with trig functions, you drop them completely.

@krisheka6247 3 жыл бұрын

Please upload more and more videos ☺️🙏

@Pampersnoot 3 жыл бұрын

I paused the video and did the problems myself, using your explanation to check my solutions, and all went swimmingly. 😁 I have been studying the material online as well, but I must thank you for motivating me to actually engage with physics and not merely collect trivia through my consumption of science videos. My piece of constructive criticism is that playing fast and loose with the signs of your vector quantities, as well as the number of significant figures your are working with, may encourage bad habits among the viewers.

@TheHuesSciTech 3 жыл бұрын

Pedantic correction: at 17:00, you wrote 10 m/s^2 instead of −10 m/s^2. If you actually evaluate the formula as written, you get y = 8.3 m. So 7.5m is the right answer, but the working is wrong.