Kinematics Part 3: Projectile Motion

[@azar9383]

I pay $1000/term for physics in collage for nothing and come here to learn everything for free. big respect for you sir.

[@txu6666]

1000dollars and cant spell college

[@azar9383]

@@txu6666 last time i checked i was engineering student not english 🤔

[@rxyyxn7465]

@@azar9383 but college is a common word

[@azar9383]

@@rxyyxn7465 fuck sake it's a bloody typo, leave me alone. That's no the point 🤦‍♂️

[@SM-ht7qf]

Azar Last time I checked, academic writing is a big part of college, idiot.

[@ibraheemwahdan5138]

I couldn't understand this stuff for 2 weeks and this 7 minute video taught me everything. There's a special place in heaven for people like you. Luv u!!

[@gauravtripathi7918]

Pls repeat kinametics chapter one more time maybe you miss projectile motion.

[@bdmosinan7384]

Yuup, I have actually same opinion.

[@johnenryqkarispe7695]

well yeah hes jesus haha jk

[@findo9615]

@@johnenryqkarispe7695 lol

[@shonib6533]

Ibraheem Wahdan Yet didn’t get a like from Prof. Dave

[@Czar7274]

The fact that you can keep this under 10 minutes and include everything is amazing. There's literally a 1 hour video on the exact same thing.

[@antrelle7480]

Had an hour lecture on it and left with nothing lmfaoo

[@hi-its-matt]

don't forget that the one-hour video is by a teacher that explains it worse as well

[@lovewhenshe]

@@hi-its-matt for real😂

[@legionxfretensis1010]

I'm doomed, I can't understand a single thing you or any other physics teacher is saying...why the hell did I take this god forsaken subject?

[@thehomestead5387]

Praying for you

[@legionxfretensis1010]

@@thehomestead5387 I passed the Course, I’m going to be a senior this year!

[@cubation9254]

@@legionxfretensis1010congrats!

[@ntr0g3n18]

​@@legionxfretensis1010Congratulations homie 🎉

[@asia1174]

Just started this mess, feel the exact same way. I hope I end up as lucky as you cause all I’ve been doing is looking confused and failing every test

[@kennethringo9137]

Heads up: If you input -14^2 / 2 x -9.8 you will get 960.4. This is because the equation itself is ambiguous. You will need to input -14^2 / (2 x -9.8) and it will give you 10. This is for the checking comprehension part.

[@renzorvillecaidoy1308]

hello My apologies , still professor Dave's equation in the last part is ambiguous .

[@renzorvillecaidoy1308]

hello its negative 10 , why is its positive 10 ?

[@renzorvillecaidoy1308]

why we need to divide where infact there is no division part in the formula

[@naomibukusi1391]

Thank you so much 😅😅

[@StatesmanRJL]

Agree

[@MysterioIII69]

I thought I was doomed, not understanding anything. I came here, spent 7 minutes instead of the 3 hours my teacher spent, and understand everything. God Bless you! If there would be more people like you, planet Earth would be heaven.

[@Hemingslay]

An immense thank you to you, professor Dave! I just started physics classes this week and I’m using these videos as supplemental material for what the courses lack. Your explanations are thorough and easy to comprehend. You’re the best

[@omarali-om5vj]

These are so good professor dave. ive gotta say your channel compared to the other youtube educators like khan academy and Patrick jmt and so on is very underrated. I think in a short time your channel will really blow up simply because the clearity in the educational content you provide is nearly unmatched.

[@ProfessorDaveExplains]

thanks for the kind words! i'm hoping this year will be a big one for the channel in terms of growth. tell your friends!

[@sehmio]

I completely agree with this comment!

[@danielmarcial9957]

So true. I have just recently knew this channel. And then after you watched and studied with it, it's like magic with Professor Dave's explanation.

[@imbatman4665]

I'm telling all my friends and help them get their grades just like mine because of my professor dave

[@sathare]

Good

[@terryyoon1856]

I'm currently tutoring some of my friends AP Physics 1 and C: Mechanics, because of your vids, my tutoring is much MUCH easier then it initially was!! You deserve much more views and subs!

[@역행호흡의역행]

광쌤이 더 잘함...

[@jtcoulter9571]

my college physics book is like trying to read Latin so youtube is where I go for literally everything lmao

[@shish992]

college? I gotta learn this for grade 11 😭

[@demia5621]

@@shish992 im in 11th grade with a college physics textbook 😭

[@smitabhosale7904]

@@demia5621 me too 😭😭

[@yowsypsyp3580]

It's unfair this is our lesson in grade 9

[@elevent33n79]

😭the assignment that decides whether i graduate or not

[@gabyhernandez1434]

I have been trying to learn this for 2 months, and this 7 minute video taught me more than my teacher 😭 thank you !

[@hamzek3981]

What? Really nigga!?

[@xfire3778]

Hamze k that was my same reaction except without the n word lol

[@jashyjancaestoque3421]

I just remembered that this video saved me from failing my physics class, months ago... God bless you professor Dave!

[@OhHeyItsCom]

Thank you so much Dave! This video helped me fully understand something I couldn’t wrap my head around over the course of a 2 week unit.

[@iprohoodini7889]

Dude, you're amazing. I've been trying to find out how this works through our school book to no avail. You made this 7 min video and explained everything very nicely. Thank you.

[@lona3763]

"We've been throwing a lot of rocks off of cliffs lately, so lest's throw one more" LMAO yes every physics book ever

[@Carsian]

Normally I scroll by all these comments thinking that they overreact a lot when it comes to your helpfulness but now I'm _really_ trying to crunch for physics and MAN are you saving my bacon for real. Thanks Prof.

[@wantsomesushi6414]

You literally just saved my physics test. Thank you.

[@انامشبحبالطعميةوالمنسف]

our book complicate the lesson with their pictures to the degree that you start to think that this lesson is impossible to people in your age, and in addition they don't explain enough, you do the very contrary of that, you present a simple pictures with words that are enough to understand everything. BIG FUCKING LOVE for you dude.

[@ynohdomi]

You saved me from failing my physics quiz.

[@rajveerbagri4492]

I'm gonna hope it saves me on my test

[@betomaldonado2933]

Oh welp im abot to fail mine

[@maxbibby7777]

@@betomaldonado2933 same I have one in 20 minutes and forgot to study

[@betomaldonado2933]

@@maxbibby7777 lol i actually passed the corse thank to covid,but bearly

[@zenjon7892]

You threw information in your lecture that my previous phys 1 teacher didn't and now it makes so much sense!

[@nirupamam2814]

Sir you know everything and you also know how to make the people know these things easily..You are the best professor in the world..You made me understand the complicated things very easily..

[@samsworld3571]

My teacher was unable to teach me this concept with 3 classes with each 50 minutes but this video did in just 7 minutes. Thank you so much really grateful.

[@solb.3002]

I hate physics bcz my teacher doesn't explain a single thing...just tells us to watch KZbin videos and read the book but sometimes some chapters are hard to be self thought..and you need an actually human being to tell you what's the steps of solving a problem.

[@R1ver7th]

your videos are very helpful for me because i find it very hard to pay attention in a classroom environment. i try, but fail consistently. however i know that by combining your videos with what i was able to catch in class, i always end up with a good grade. here's hoping it keeps working for my last year of HS!

[@marigussio8723]

Professor Dave , you helped with the Projectile Motion unit for physics. I really did not know how to solve this question for physics but you helped with that so thank you.

[@iosandroiduser4104]

Damm I studied this at school and at home for total of more than 5 hours and this video helps me understand it in 7 minutes. 👍👍👍👍👍👍

[@wendyleelinmeng6]

I've been a new subscriber for the past few days and your videos are truly amazingly understandable than other famous educators which gained tons of views. Now i can ensure good grades for my chem and phy thx to u :)!

[@reginasuliman1432]

Professor Dave after 8 classes explaining projectile motion I finally got it in 7mins THANK YOUUUU!!!!

[@christina2071]

I have a physics midterm tomorrow and let me tell you I was lost! Thanks for this!

[@thatsnotme3235]

Your explanation for independent x and y motions is spectacular! Thank you!

[@D_kiki999]

WHY CANT MY PHYSICS PROFESSOR BE LIKE YOUUUUUU😭😭😭

[@marcelineendjala]

Big respect for this man y'all....physics ain't no joke....where can I find a brain like this

[@spectredivision8971]

I'm surprised that students needed to learn this in order to become a coffee maker. 🤣

[@jha_mine2109]

I'm crying awhile ago with a thought that I'll be failing my physics, college life plus terror prof might kill me. Thank you professor Dave! You are an angel!

[@lac4963]

You're an angel sent from heaven. Now I'm sure I'll pass my exams. thank you Prof. Dave

[@yomz8876]

Finally I get it,I’m gonna refer to all of my family and friends,they gotta how amazing of a teacher you are

[@yami4209]

I'm so cooked bro

[@arooba6807]

Us

[@peanutbutterBrisket99]

*we're so cooked bro

[@SkroefTV]

😭😭😭😭😭

[@nathanos123]

me too bro me too

[@kimeun-young3451]

In 2023 It tooked me 5min to understand "2 weeks of school explanation" just because ur making it easier by giving simple examples from real life UR A GENIUS

[@Lucky10279]

You made this concept incredibly simple. I was struggling with applying it because I was completely overthinking it. This video clears things up. Thank you so much! 😀

[@DavisbestonBeston-gz3zw]

Very true😃

[@ejgaming83]

Wow you are the best, I literally learned this with one video when I couldn’t during class. And it even has a comprehension check!

[@whatever0707]

thank you so much for this!!! couldn't understand my teacher for the past two weeks, yet you helped me understand the entirety of parabolic motion in just a couple of minutes.

[@leilagtali3183]

Wow it's like I got a last minute power up while fighting the final boss. This is my 3rd week of teaching myself physics online... it's also been the hardest! Physics kicked my butt... then everything just clicked from this video. Finally ready for my exam in three days. Thanks Professor Dave :)

[@wokks9461]

in 7 minutes it has explained 3 hours of teaching in a better way thankyou, saved me for a test i have in an hour

[@matthias0054]

You made it so simple for me, and I can finally understand all of that. Thank you so much!

[@antrelle7480]

I have this brilliant person for a professor but they cant teach because some major points were missed and here I am learning from youtube. You're amazing!

[@agus-__-tin7966]

Ok I’m 1 Minute in and I can alr see me failing my physics test tmr

[@GiancarloCordova-f1y]

y u rite 👍🏻 dat

[@amandadal8913]

How'd it go

[@jamaljones4714]

thats exactly whybi failed physics 2 times, i kept telling myself im gonna fail, once u retake physics or actually comprehend physics ur gonna be like “i was doubting myself for no reason its not even that bad” 100%

[@agus-__-tin7966]

@@jamaljones4714 well I can now confirm that I did fail that test but I just buckled down and actually studied for the nest one and that counted for half my grade and I did surprisingly well so it’s Alr

[@futuredr.7815]

I love you so much prof dave Im up late studying for a test but you're getting me through this. I'm not up at 2am crying over my text book because you break things down so well and i'm too broke for a tutor. Stay amazing!!!

[@HorizonSpeed26]

got the answer for check comprehension first try ,YES!

[@Alice-wy7ih]

Can I ask you a question? hahaha I don't know why is my answer is -5.6 how did you get it?

[@Theseanstarfish]

Professor Dave,you are my savior.

[@mayhue272]

this has helped me sooo much, i went on a vacation during the start of my physics course and my teacher gave me no help. This has taught me more than my teacher could in 2 hours

[@gabrielledriz6624]

Our physics teacher is really nice but i'm scared of asking her for help and none of my friends know how to explain it to me so this video was a life saver! Thank you so much

[@gabrielledriz6624]

I got 39/50 in my exam thank you so much!

[@usmanalimanj6840]

Well planned lecture.

[@dennisdesalme]

This video really broke it down well. Thank you so much. I really like that you used the original kinematic equations, rather than canceling and deriving a new equation for max height, which I don't want to memorize.

[@laikasandiego6827]

it is the best of all video lectures it really helps me to understand my report

[@scenify3758]

the feeling of getting the comprehension question right is unmatched

[@ce-cesworld4382]

hi professor dave I have a question. you said to use -100 for the displacement. Do you always use -100? Thank you!

[@ProfessorDaveExplains]

No, that's the height of the cliff.

[@ce-cesworld4382]

@@ProfessorDaveExplains ok got it thank you!

[@HowdyElSalvador]

Thanks, I had the same question! 🤦🏽‍♀️

[@MariaTerrobaRivero]

Love the video thank youuu so much for explaining this visually and in a practical way! The only thing I would change is showing how you did the quadratic equation instead of saying after plugging into the Quadratic Equation and then giving us the answer you got

[@MariaTerrobaRivero]

Could you also explain the comprehension question visually?

[@BEEFYSTICKMAN]

This video is really well done, thanks Professor Dave!

[@madeleinecallan3153]

In order to not have to do the quadratic equation, you could know that vox = vo(costheta initial)t and voy=vo(sintheta initial ) -1/2gt^2 For objects that are simply released not shot or thrown with a vo other than zero, you can infer that no angle is made.

[@leeshhameed5096]

physics jesus

[@kinanzafra9184]

You have saved us from total confusion. You are truly a savior

[@jaz8615]

holy shit i finally understand what is this sorcery

[@kobja2248]

Dave your my favorite KZbinr. You help me with my botany class and help me crash course my gfs physics class to help her on mid terms.

[@lbtheman12345]

Is there anyway to solve for time without the quadratic formula. For example, change in Velocity (y-direction) = (acceleration due to gravity) * (time)

[@sethtulud7802]

how did you solve for the time? I tried it using quadratic formula but I got 19.288

[@NiflaNazeer]

“We have been throwing alot of rocks lately and lets throw another one from our favorite 100 m cliff”😂😂😂 this made me laugh so hard !!! Love your humour and appreciate your work alot sir❤️❤️❤️

[@meganmecham7651]

You saved me from failing a test. Thank you...

[@sarahmawla9793]

I am French educated, but I couldn't find a good video like this one, all the respect for you❤️

[@dharanijena6423]

Thank you very much sir.

[@ImVeryBoredPlzHelp]

I’m in 8th grade and this video helps so much 😭 I thought I was gonna fail projectile motion but this gives me hope

[@anuragchavan7900]

Thanx for making concepts clear

[@marufhossain9189]

This entire channel is a God send

[@rubyhaas5986]

Hey Dave, could you explain why you used this specific kinematic equation at the end of the comprehension question? I used the delta x=v(i)t + 0.5 at2 equation and got a different result.. Thank you very much!

[@ProfessorDaveExplains]

can't use that one, we don't have any information regarding time!

[@JungGung]

i have a question professor.....do angle of trajectory,,,affects the applied force? example if you want to reach vertical distance....do you need a lot force if its90degrees and lesser if its30degrees?

[@mrabdullah7078]

@@JungGung it is kinematics . We don't study force here

[@carinapotagin3015]

Thank u so much. My professor made it so difficult. I have been trying to solve these exercises for hours and your video just helped me out in a few minutes. You are an angel.

[@xavierbahunsua7871]

i honestly didnt get how you got the -4.10 and the 4.97 answer sir, i do not know about the quadratic equation. help

[@ProfessorDaveExplains]

check out my mathematics series! all the help in algebra you will ever need.

[@RocketFriday]

x = A + B + C 0 = -4.9 + 4.25 + 100 Using the Quadratic Formula: x = - B + | - √B^2 - 4 * A * C ------------------------------------ 2 * A Dunno why "Professor Dave Explains" cared more about viewership than sharing that knowledge but that's what you're missing.

[@imyasharya]

Oh thank you, I understand it at last after 1 months. I didn't knew how these vectors split works but now I know it and in a better lovely way...

[@dillon8518]

Why do I get d=40

[@dmytrolatysh9244]

-196/(-19.6)=10 You multiply 1/2 to (-9.8) thats why you got 40.

[@peterhayman]

so helpful splitting into x and y, i didnt get it until watching your previous two videos, thanks!

[@quisharamos902]

why i cant understand it tho i watched it many times :((

[@aarohanyt7374]

Basically if u throw something at the sky , it will travel in a parbola like shape 2 motion takes place 1)vertical motion 2) horizontal motion Lets say u throw at 30degree from a horizontal(imaginary) with initial velocity of 2 m/s Now come something intersting into play , we know you are throwing the rock at an angle at the sky (like a diagonal) So lets break that single vector into 2 vectors Vx along X axis (along ground) ,Vy along Y axis (a straight line drawn towards the sky which is perpendicular to ground) Visualize this situation ! What happens ? The rock goes up to certain height and falls down (that height is called maximum height ) The staring point and ending point of rock is on the ground and this length is called the range Interesting thing here Vx represents horizontal motion Vy represents vertical motion When we spilt a vector into 2 perpendicular vectors ,its called resolution of vectors ( look this up on yt to clear things up) So what we do is , the vector u (intial velocity with we throw the rock) is spiltted into ucos30 ( along the X direction ) and usin30 ( along Y direction ) we take ucos(theta) as horizontal motion because (theta) is the angle made by our inital vector with the horizontal(the imaginary line which is parallel to the ground ) The horizontal motion of rock(ucos(theta)) remains constant in projectile motion because there is no disturbance or force The verticle motion goes on increasing , reaches maximum height and goes on decreasing . Thats it just focus on vertical motion which changes due to g When t=1s , Vy =usin(theta) -g*1 When t=2s , Vy =usin(theta) -g*2 Whent t = n s , Vy =usin(theta) -g*n

[@nirupamam2814]

PROFESSOR DAVE EXPLAINS is the best KZbin channel.. I don't watch any other

[@mojahedkhaled480]

WHY IS THE ACCELERATION -9.8

[@jianyanchoong5762]

Mojahed Khaled acceleration due to gravitational force

[@bratzillla]

my brain stops working sometimes....I hear him speaking but can't make sense of what he's saying uuughhh

[@ejgaming83]

Bro take a nap lol it helps

[@twinklestar5646]

that's ur fault

[@iraqi6207]

He's trying to give so much information in shortcut that's very common on KZbin..you just have to replay the video 2 or 3 times that better than watching a 21 min video xD

[@junesept234]

Play it in slower speed.

[@rec9189]

Try to drink coffee. It improves focus

[@manjunathhegade7997]

Sir..You are really genius..We are lucky to watch your channels.... Thanks for sharing your excellent knowledge..

[@Noah.Nation]

lost me at 4:16 :/

[@unrealgalaxy9669]

after watching this video i finally got some level of comprehension of what to do with these type of problems. Thank you good sir!

[@sixela-f3y]

why did the time become 4.97 seconds???? can someone explain that to me!!!

[@maianna2768]

MY EXACT QUESTION RN AHHH

[@JenniferRokks]

he used the quadratic equation formula and got two different answers but time cant be negative so the time answer is the positive one.

[@piratheeshbaskaran3450]

Your really good at this you deserve more views

[@Chillwave.o]

People here are from college? Im a 3rd year highschool student😂

[@SamsEdits1133]

My teacher never explains anything, so I have to watch videos online to learn, and your videos always help

[@julianjaza3118]

i feel stupid :(

[@Guessy66666]

we r cooked together

[@Mrpar827]

I wish they gave the option to watch your videos then take test to get a college degree cause these teachers have really started to not care anymore. This is a lot quicker and easier to understand and it puts 1 hour into a couple minutes while making sense.

[@spudmagnum7394]

The reason this guy's method of teaching is so effective is because he teaches things in such a way that a student would understand, too many teachers like to overcomplicate the concept instead of breaking down the fundamentals.

[@colem.8914]

went through 2 weeks of this stuff in physics not understanding 2d projectile motion at all, but this cleared it up so much

[@truemusic3064]

In the given problem, D=−100 meters represents the vertical displacement of the object, which is negative because the object is falling downward from a height of 100 meters above the ground.

[@nigelgeorge43]

There are three types of projectile motion: 1) Vertical Projection (no Horizontal motion) 2) Horizontal Projection off a cliff/ledge (No vertical motion initially but develops throughout the trajectory due to gravity) 3) Angular Projection (in this video) Just thought I needed to highlight these.

[@ajreyes407]

That's what confused me

[@Teramishu168]

Bro this got me understand my whole 3 lesson for two weeks in just 7 mins. you great!

[@crippl3dhobnob]

Thank you so much for this Dave, I have been drawing on a robotic assistant and I ran into my nemesis.. My inability to learn in a progressive manner. I've already calculated the dimensions for it to be able to traverse up stairs (like a village idiot I headed out with a noteblock and measuring stick and measured different kind of stairs in my neighbourhood😂). However at the time for my calculations on a weighted robot up a staircase I realized, I must have snoozed at that class. I need to calculate a counterweight and how much it has to move to counterbalance the robot under load up a staircase. I usually learn backwards I've realised since a young age, I wanted to understand the fundamentals and the numbers where never important. I will rewatch this series a couple of times to make it stick on my smooth brain, as I never was a fan of school and mostly hang out with the janitor. I love building stuff and understanding how stuff works. I learned that I'm an autistic at 39yrs of age and not just a retarded microbe, I just absorb information differently and process it in another way. Your visual representation of the equations helps me immensely to get the information into the shrivelled gray matter of my 2 stroke vankel 0.03 hp of a brain.

[@adrianneadonis7401]

I love that you explain for students to actually understand physics 😂❤ keep uploading it's helping 🥳

[@user-rj1qg2if7n]

Thank you! My teacher just started using trig and was like “ok that’s how you do it” without any explanation!

[@SÀN-D-MAN]

Hope this and some other teacher of KZbin help me build a good base fundamental knowledge about the subject, so good so far

[@miamartine9682]

somebody has got to give this man a medal😭❤️

[@mulaparthinareshbabu3866]

Iam a 8th class student but you made me to understand more than 10th standard ! Thank you sir 🙏