Тёмный
No video :(

Horizontally launched projectile | Two-dimensional motion | Physics | Khan Academy 

Khan Academy Physics
Подписаться 119 тыс.
Просмотров 690 тыс.
50% 1

In this video David explains how to solve for the horizontal displacement when the projectile starts with a horizontal initial velocity. He also explains common mistakes people make when doing horizontally launched projectile problems.
Watch the next lesson: www.khanacadem...
Missed the previous lesson? www.khanacadem...
Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy’s Physics channel: / channel
Subscribe to Khan Academy: www.youtube.co...

Опубликовано:

 

21 авг 2024

Поделиться:

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист
Посмотреть позже
Комментарии : 279   
@ericaritchie9136
@ericaritchie9136 7 лет назад
I am such a visual learner and I do online school so it's hard for me to teach myself some things especially in physics. This really helped me, i appreciate it.
@oneagainsthumanity7893
@oneagainsthumanity7893 3 года назад
3 years later and all we have is online school
@josephpate7646
@josephpate7646 3 года назад
@@oneagainsthumanity7893 this person is probably in college now😪
@oneagainsthumanity7893
@oneagainsthumanity7893 3 года назад
@@josephpate7646 Damn i never thought about that 🤭😔
@delwlr
@delwlr 5 лет назад
I'm watching this the day before my physics exam lol
@cappuccino2901
@cappuccino2901 5 лет назад
how did u got?
@keane6635
@keane6635 4 года назад
lmao fuckin same HAHHAHAHHAAH
@herrerarafael1914
@herrerarafael1914 4 года назад
Im watching this just minutes before final exam
@maharajdattumaharaj5360
@maharajdattumaharaj5360 4 года назад
I'm watching on the day of exam, I have 2 hrs left for the exam
@codyclark7525
@codyclark7525 3 года назад
right there with you lol
@stormwolf4488
@stormwolf4488 6 лет назад
Hopefully the cliff diver doesn't ignore air resistance lol
@xanthman7528
@xanthman7528 4 года назад
If they do ignore it, then that's pretty impressive.
@MathPhysicsEngineering
@MathPhysicsEngineering 2 года назад
To those are intrested in an in-depth analysis of the physics and the gometry of teh projectile motion, with simulation and visualization I recommend: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-HPehCUv6bEY.html&ab_channel=Math%2CPhysics%2CEngineering
@xx-gamer-xx9476
@xx-gamer-xx9476 7 лет назад
i swear i understood everything thing more than the class
@fumikotsukumi017
@fumikotsukumi017 4 года назад
“They REAAAAALLLY want to plug in 5m/s as the velocity in y; but don’t do it, it’s a trap.” I like this dude already
@premseelan
@premseelan 4 года назад
"People are just *dying* to stick that 5m/s in there..." 😂
@andreasbringemeier3689
@andreasbringemeier3689 7 лет назад
why arnt my physics teachers this good?
@charliephinney9105
@charliephinney9105 6 лет назад
Looks like your English teachers aren't the best either.
@chiraggupta2645
@chiraggupta2645 6 лет назад
Lol....same
@carlenger9707
@carlenger9707 6 лет назад
Your profile picture makes you look like you're 5. There's literally no way you're in physics.
@MsOluyemi
@MsOluyemi 5 лет назад
Svensk Gamer that could be his son -.-
@nadineebada6557
@nadineebada6557 4 года назад
@@MsOluyemi or his brother
@mimichfury6329
@mimichfury6329 4 года назад
U clearly understand students soo damn well mate. My mind is oficially blown by your teaching.. thnk yu mate
@MegaJefflin
@MegaJefflin 6 лет назад
This teacher is better than my teacher, finally someone explain this with human language, and also this teacher is fun, dont try this at home lol
@rubycannon
@rubycannon 6 лет назад
Thanks! My physics teacher bores me to sleep and I end up learning some of it on my own time. Wonderful explanation!
@jorgezheng5169
@jorgezheng5169 5 лет назад
Words cannot express how much you have helped me. My gratitude for you is endless.
@migueldiax7947
@migueldiax7947 2 года назад
I am in AP physics this year and the teacher blew through the first few “recap” lessons, I didn’t take any prior physics class so I’m in a loop lol. Very well explained!
@jacobtlg9029
@jacobtlg9029 Год назад
This guy litterally saved my grade. I am a freshman in highschool. Im not very smart but the school still decide to put me in physics. I am so lost all the time. It also doesnt help that my teacher is kind of bad at teaching. I think she might have dementia. REgardless thank you so much for this awesome video you really helped with understanding horizantally launched projectiles.
@kaylynn3459
@kaylynn3459 6 лет назад
Lmao I love this! I’m in the library without headphones, and this so amusing with no sound and the captions on because of the humor. Thanks for the help!
@Landoscurlyhair
@Landoscurlyhair 3 месяца назад
Thank you so much for this! 😭 my school doesn't do lectures but instead just give us notes. This topic, they didn't really elaborate about this one and tomorrow is our exam, FINAL EXAM. 😭. Now I understand everything about this now 😭
@Unveiiled
@Unveiiled 7 лет назад
Really helped me, got my a in the exam! :)
@temi7036
@temi7036 4 года назад
Thank you so much!! I have a physics test tomorrow on horizontal projectile motion and you explained this really well
@boshtua
@boshtua 6 лет назад
Got a test tomorrow and I have no idea what I'm doing, I'ma watch this and hope it helps
@jaydenandrews8847
@jaydenandrews8847 5 лет назад
How do you do this if you’re given the range but not the y value
@davidsscope
@davidsscope Год назад
I searched "why greater heights provide further distance when jumping into water" because of the movie "Deep Water Horizon" showing Mark Walberg climbing higher up the drilling platform before jumping to clear the fire in the water. Now I know why he did what he did. And your teaching skills are amazing
@shanks6190
@shanks6190 3 года назад
I'm watching this DURING my physics exam
@Furzayra02
@Furzayra02 Год назад
Thanks this was very helpful
@dawitergichofanta7093
@dawitergichofanta7093 3 года назад
The most open person ever. YOU ARE THE BEST, DAVID
@justinkim4861
@justinkim4861 7 лет назад
taking the class next year wish me luck!
@codedballs
@codedballs 7 лет назад
Justin Kim good luck
@waffielz3106
@waffielz3106 6 лет назад
try hard
@stephanieshen3713
@stephanieshen3713 4 года назад
God bless khan academy
@cmackatlanta
@cmackatlanta 6 лет назад
How would we determine the angle at which the person hits ground at various distances?
@chard0nka
@chard0nka 5 лет назад
Hey thank you for this video & explanation! Really helped me in reviewing for my physics quiz!
@jikunue9187
@jikunue9187 6 лет назад
you should be my physics professor!
@allanerissat2296
@allanerissat2296 6 лет назад
Like Bucky Roberts, but in Khan Academy! Great video!
@MegaJefflin
@MegaJefflin 6 лет назад
lol, exactly, but this one is funner
@maki4568
@maki4568 6 лет назад
A bullet is fired 30deg to the horizontal with a speed of 200m/s. The acceleration of the bullet is 15 m/s^2 vertically downward What is the change in velocity after 2 seconds?
@lopamudrakar5680
@lopamudrakar5680 5 лет назад
Hey! Initial velocity= 200 m/s, final velocity after 2s= 186.81m/s, the change in velocity after 2s is -13.19 m/s.
@lt.ifeplumz1315
@lt.ifeplumz1315 4 года назад
Velocity only changes during vertical motion. So, we are neglecting the horizontal motion since the velocity here is always constant. During vertical motion, Acceleration =Δv/t. Initially, during the vertical motion, the initial velocity is usually zero. 15ms-² = Vf - 0./2s. Vf = 15ms-² × 2s. Vf = 30ms-¹. ΔV = 30 - 0 = 30ms-¹.
@tobiiyarou
@tobiiyarou 3 года назад
i genuinely wanna meet this guy
@toereh7848
@toereh7848 3 года назад
I’ve learned more from this than 4 months with my teacher
@bishaldas6790
@bishaldas6790 5 лет назад
More efficient than my phy classes
@bla__berries
@bla__berries 3 года назад
Lol. This part of projectile motion always confused me but I love the way it was explained here. I even laughed😂. I do not laugh while learning physics.
@waffielz3106
@waffielz3106 6 лет назад
a video not made by khan? praise the sun
@jean-christopheboucher6306
@jean-christopheboucher6306 6 лет назад
you save my night! thanks a lot!
@uzmajamil105
@uzmajamil105 6 лет назад
Thank youu
@m4lmas
@m4lmas 6 лет назад
5:25 best teacher ever
@malanil1
@malanil1 5 лет назад
lol
@glob567
@glob567 3 года назад
thank you so much, this really helped me finally understand this
@iron1349
@iron1349 6 лет назад
This stuff makes a TON more sense when you have a calculator to help with finding square roots
@saraowens8413
@saraowens8413 2 года назад
Great video. This just helped so much! I was having such a hard time with this. Thank you!
@Yourlocaljp
@Yourlocaljp 6 лет назад
BASED DAVID!!! Thank you
@amarlist1
@amarlist1 Год назад
the sound effects are great, i like Sal, cuz hes prob like super smart af, but this narrator is great too, 1:45
@alanjacob1488
@alanjacob1488 Год назад
Basically use eqns of motion and apply proper sign convention. For other cases too, when projected at an gle theta above and below horizontal
@xox102
@xox102 4 года назад
How do you find the height of the cliff given the velocity and the the distance it landed?
@kyandrew7942
@kyandrew7942 3 года назад
learning this 1 hour before our examinations
@klydeurbiztondo3601
@klydeurbiztondo3601 6 лет назад
Regarding the value of downward acceleration due to gravity, why did it happen that it is negative? When in fact the object/body is accelerating not decelerating? Can someone explain?
@carultch
@carultch Год назад
The sign on acceleration has nothing to do with whether the object is speeding up or slowing down. A negative sign on any kinematics quantity just means that it is opposite the direction you arbitrarily define as positive. It is customary to define up as positive, but you don't necessarily need to do this.
@ntokozosikhosana-zj5nr
@ntokozosikhosana-zj5nr Год назад
What we solving for how far, are we solving vertically or horizontally?
@wenymwila5021
@wenymwila5021 4 года назад
Physics I see you Thank for the video sir
@annc6152
@annc6152 5 лет назад
thank you I love you.
@ModjadjiMamaila-cs4ek
@ModjadjiMamaila-cs4ek Год назад
U are really a good tutor
@trinitywirth9329
@trinitywirth9329 3 года назад
My saving grace
@elialanaable
@elialanaable 7 лет назад
what if we needed to find the total distance?
@mixedguy2038
@mixedguy2038 3 года назад
I love the way you teach
@keniatorres5598
@keniatorres5598 5 лет назад
can anyone explain how to do the math portion once he gets to the radical
@adilmohammed6897
@adilmohammed6897 4 года назад
hi, so when you take vertical displacement (dy) as + 30 instead of -30, you will find that the value inside the root (that long line, i am assuming that's not what they call in your country) becomes negative. now, the square root of negative numbers come under the family of complex numbers and most calculators aren't build to do that (cos complex numbers are imaginary and unlikely anyone is gonna use irl) hope it helps
@successparody
@successparody Год назад
I found this extremely helpful. I really appreciate what you guys do. Thank you
@muneebanjum6268
@muneebanjum6268 3 года назад
BEST EXPLANATION EVER!!!
@peppervfx
@peppervfx 2 года назад
My teacher accent is kinda hard to understand so helps out a lot. Thank you.
@cheeengm
@cheeengm 3 года назад
Thanks. It helped me a lot
@The_Unintelligent_Speculator
@The_Unintelligent_Speculator 5 лет назад
Yes. I could have been a genius with this sort of tuition. Cheers 🍻
@brianbruno1786
@brianbruno1786 6 лет назад
Can you do colliding??
@lixinz.4708
@lixinz.4708 6 лет назад
5:25 how is gravity -9.8 if your object is going down and the gravity is constantly facing downward? wouldn't it be positive?
@nidhiupadhyay416
@nidhiupadhyay416 5 лет назад
No, acceleration is a vector quantity and object is falling downward.
@ziyadfara4760
@ziyadfara4760 Год назад
What a beautiful video. Explained so well. Great teacher.
@babarm9815
@babarm9815 7 лет назад
This has to be the best video ever.
@alstugvideos
@alstugvideos 9 месяцев назад
Thank you very much for this.
@voyager7971
@voyager7971 4 года назад
Thanks for the refresh!
@Hino_55
@Hino_55 4 года назад
Key takeaway is: The elapsed time for the motion of the object represented in its x & y component motion is the same for both x & y components. Well explained Sir David! Thankyou!!!
@tusharahmed3151
@tusharahmed3151 6 лет назад
aweosome man. very good explanation
@rheanng1920
@rheanng1920 5 лет назад
thank u !! my physics textbook nor teacher does this good of a job lol
@thecurryoflife3
@thecurryoflife3 3 года назад
11:17 How come the time t wasn't squared?
@altunartuch5094
@altunartuch5094 3 года назад
Because half of zero is just zero times by t squared is just zero the last part if the equation doesn’t matter
@Speedsterchameleon
@Speedsterchameleon 15 дней назад
this is good for me 8th grade
@sanskaragrawal8167
@sanskaragrawal8167 7 лет назад
David speaks like Kenny Sebestian 😂😂
@starboii568
@starboii568 5 лет назад
Why is the acceleration negative if you are going downwards
@phendyella9742
@phendyella9742 Год назад
I finally get it . Thank you
@TheScienceCube
@TheScienceCube 5 лет назад
Even If 20% of the teachers in the world start teaching like this, the world will advance a lot faster!!
@gree7017
@gree7017 2 года назад
Thank you. This really helps me. Thank you so much.
@BMitts
@BMitts 3 года назад
This literally is more helpful than the videos my teacher makes
@snapebtwalt
@snapebtwalt 5 лет назад
THIS WAS SUCH A GREAT VIDEO DAVID > SAL
@rakiedi8347
@rakiedi8347 2 года назад
Such a good Explanation 👍👏 It helped tnx 😊
@ngkean9743
@ngkean9743 6 лет назад
thk man appreciate
@markkaranja11
@markkaranja11 3 года назад
What if we are asked about the horizontal and verticle components of the velocity when the object hits the water?
@gurkaransingh1922
@gurkaransingh1922 5 лет назад
great video ,i understood everything ☺
@shrekkosswampinar7088
@shrekkosswampinar7088 3 года назад
Thank you. This video helped me a lot
@Dimwol333
@Dimwol333 5 лет назад
I love this guy. Good humor and explains in the easiest way. But I was looking for something else. I knew how to solve this problem. I was searching for muzzle velocity. But got caught still. hahah
@LinhNguyen-ff3on
@LinhNguyen-ff3on 5 лет назад
Thank you this was very helpful!!
@biggiesmokes9103
@biggiesmokes9103 2 года назад
We all in this boat together
@jacobpickos733
@jacobpickos733 11 месяцев назад
I love this. Thank you.
@ThusSpokeSpooky
@ThusSpokeSpooky 3 года назад
Omg Holy Shit, this came in clutch for my physics exam.
@carlenger9707
@carlenger9707 5 лет назад
8:38 "It's a trap"
@giovannadealca3187
@giovannadealca3187 3 года назад
thanks for it😁
@fyufyu776
@fyufyu776 5 лет назад
60 divided by 19.6 is 3 why isnt it 2.47?
@zaneninjago410
@zaneninjago410 2 года назад
this is great thanks!
@aSuspect1
@aSuspect1 4 года назад
Thankyou so much
@alstugvideos
@alstugvideos 9 месяцев назад
This might sound strange but what software are you using?
@Physics841
@Physics841 3 года назад
perfect explanation
@byehikaveh
@byehikaveh 4 года назад
Thank you so much! Im not going to fail my physics test tom
@goutomkishordas4687
@goutomkishordas4687 Год назад
life saviour
@yaredkahsay3584
@yaredkahsay3584 4 года назад
When we find the time why we didn't include the 1/2 I mean 30m= 0+1/2(9.8m/s)t square &30m.2=(9.8m/s squar)t& 60m=(9.8m/s square)t square & t=√60m/9.8 & t≈√6.11≈2.473s
@Sam-rg7tg
@Sam-rg7tg 3 года назад
Thank you so much it helped a lot
@jologendary
@jologendary 4 года назад
can i ask why you multiplied both sides by 2 on the equation of getting the time?
@isonif2503
@isonif2503 2 года назад
thank you very well explained
Далее
Physics 3.5.4a - Projectile Practice Problem 1
8:12
Просмотров 521 тыс.
🔥НОВАЯ БАТАРЕЯ?😮
00:40
Просмотров 253 тыс.
Internet is going wild over this problem
9:12
Просмотров 34 тыс.
introduction to projectile motion
5:09
Просмотров 606 тыс.
De Broglie wavelength  | Physics | Khan Academy
11:20
Просмотров 443 тыс.
Kinematics Part 3: Projectile Motion
7:06
Просмотров 1,8 млн
The equation of a wave | Physics | Khan Academy
14:43
Просмотров 837 тыс.
Projectile Launched of a Cliff
11:17
Просмотров 92 тыс.
The SAT Question Everyone Got Wrong
18:25
Просмотров 12 млн
Solving Horizontally-Launched Projectile Problems
14:00