Horizontally launched projectile | Two-dimensional motion | Physics

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

Рет қаралды 688,606

8 жыл бұрын

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.
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Пікірлер: 278

@delwlr 5 жыл бұрын

I'm watching this the day before my physics exam lol

@cappuccino2901 4 жыл бұрын

how did u got?

@keane6635 4 жыл бұрын

lmao fuckin same HAHHAHAHHAAH

@herrerarafael1914 4 жыл бұрын

Im watching this just minutes before final exam

@maharajdattumaharaj5360 4 жыл бұрын

I'm watching on the day of exam, I have 2 hrs left for the exam

@codyclark7525 3 жыл бұрын

right there with you lol

@ericaritchie9136 6 жыл бұрын

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 3 жыл бұрын

3 years later and all we have is online school

@josephpate7646 3 жыл бұрын

@@oneagainsthumanity7893 this person is probably in college now😪

@oneagainsthumanity7893 3 жыл бұрын

@@josephpate7646 Damn i never thought about that 🤭😔

@stormwolf4488 5 жыл бұрын

Hopefully the cliff diver doesn't ignore air resistance lol

@xanthman7528 4 жыл бұрын

If they do ignore it, then that's pretty impressive.

@MathPhysicsEngineering 2 жыл бұрын

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: kzfaq.info/get/bejne/fraVm6aG25zGdY0.html&ab_channel=Math%2CPhysics%2CEngineering

@xx-gamer-xx9476 7 жыл бұрын

i swear i understood everything thing more than the class

@fumikotsukumi017 4 жыл бұрын

“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 4 жыл бұрын

"People are just *dying* to stick that 5m/s in there..." 😂

@andreasbringemeier3689 7 жыл бұрын

why arnt my physics teachers this good?

@charliephinney9105 6 жыл бұрын

Looks like your English teachers aren't the best either.

@chiraggupta2645 6 жыл бұрын

Lol....same

@carlenger9707 6 жыл бұрын

Your profile picture makes you look like you're 5. There's literally no way you're in physics.

@MsOluyemi 5 жыл бұрын

Svensk Gamer that could be his son -.-

@nadineebada6557 4 жыл бұрын

@@MsOluyemi or his brother

@mimichfury6329 4 жыл бұрын

U clearly understand students soo damn well mate. My mind is oficially blown by your teaching.. thnk yu mate

@rubycannon 6 жыл бұрын

Thanks! My physics teacher bores me to sleep and I end up learning some of it on my own time. Wonderful explanation!

@MegaJefflin 6 жыл бұрын

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

@jorgezheng5169 5 жыл бұрын

Words cannot express how much you have helped me. My gratitude for you is endless.

@migueldiax7947 2 жыл бұрын

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!

@temi7036 4 жыл бұрын

Thank you so much!! I have a physics test tomorrow on horizontal projectile motion and you explained this really well

@kaylynn3459 6 жыл бұрын

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!

@jacobtlg9029 Жыл бұрын

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.

@chard0nka 5 жыл бұрын

Hey thank you for this video & explanation! Really helped me in reviewing for my physics quiz!

@saraowens8413 2 жыл бұрын

Great video. This just helped so much! I was having such a hard time with this. Thank you!

@IcedCoffeeAndKate 2 ай бұрын

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 😭

@successparody Жыл бұрын

I found this extremely helpful. I really appreciate what you guys do. Thank you

@jean-christopheboucher6306 6 жыл бұрын

you save my night! thanks a lot!

@Unveiiled 7 жыл бұрын

Really helped me, got my a in the exam! :)

@babarm9815 7 жыл бұрын

This has to be the best video ever.

@glob567 3 жыл бұрын

thank you so much, this really helped me finally understand this

@LinhNguyen-ff3on 5 жыл бұрын

Thank you this was very helpful!!

@gurkaransingh1922 5 жыл бұрын

great video ,i understood everything ☺

@voyager7971 4 жыл бұрын

Thanks for the refresh!

@dawitergichofanta7093 3 жыл бұрын

The most open person ever. YOU ARE THE BEST, DAVID

@boshtua 6 жыл бұрын

Got a test tomorrow and I have no idea what I'm doing, I'ma watch this and hope it helps

@shrekkosswampinar7088 3 жыл бұрын

Thank you. This video helped me a lot

@Yourlocaljp 6 жыл бұрын

BASED DAVID!!! Thank you

@cheeengm 3 жыл бұрын

Thanks. It helped me a lot

@ziyadfara4760 Жыл бұрын

What a beautiful video. Explained so well. Great teacher.

@rakiedi8347 2 жыл бұрын

Such a good Explanation 👍👏 It helped tnx 😊

@tusharahmed3151 6 жыл бұрын

aweosome man. very good explanation

@gree7017 2 жыл бұрын

Thank you. This really helps me. Thank you so much.

@davidsscope Жыл бұрын

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

@alstugvideos 8 ай бұрын

Thank you very much for this.

@jaydenandrews8847 5 жыл бұрын

How do you do this if you’re given the range but not the y value

@Furzayra02 Жыл бұрын

Thanks this was very helpful

@Sam-rg7tg 3 жыл бұрын

Thank you so much it helped a lot

@jacobpickos733 10 ай бұрын

I love this. Thank you.

@zaneninjago410 2 жыл бұрын

this is great thanks!

@phendyella9742 Жыл бұрын

I finally get it . Thank you

@mateipaleacu9377 5 жыл бұрын

So amazing thank you

@muneebanjum6268 3 жыл бұрын

BEST EXPLANATION EVER!!!

@shanks6190 3 жыл бұрын

I'm watching this DURING my physics exam

@uzmajamil105 6 жыл бұрын

Thank youu

@isonif2503 2 жыл бұрын

thank you very well explained

@alanv3185 5 жыл бұрын

Thank you!

@bishaldas6790 5 жыл бұрын

More efficient than my phy classes

@rheanng1920 5 жыл бұрын

thank u !! my physics textbook nor teacher does this good of a job lol

@The_Unintelligent_Speculator 5 жыл бұрын

Yes. I could have been a genius with this sort of tuition. Cheers 🍻

@annc6152 5 жыл бұрын

thank you I love you.

@brianbruno1786 6 жыл бұрын

Can you do colliding??

@Dimwol333 5 жыл бұрын

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

@kyandrew7942 3 жыл бұрын

learning this 1 hour before our examinations

@cmackatlanta 6 жыл бұрын

How would we determine the angle at which the person hits ground at various distances?

@1o1nah 6 жыл бұрын

Very nice

@allanerissat2296 6 жыл бұрын

Like Bucky Roberts, but in Khan Academy! Great video!

@MegaJefflin 6 жыл бұрын

lol, exactly, but this one is funner

@erynnmusic 4 жыл бұрын

THANK YOUUUUU!!!!

@xox102 4 жыл бұрын

How do you find the height of the cliff given the velocity and the the distance it landed?

@waffielz3106 6 жыл бұрын

a video not made by khan? praise the sun

@jacobgordon6052 4 жыл бұрын

Any idea what program they use

@journeytonerdcity1776 2 жыл бұрын

good stuff.

@jikunue9187 6 жыл бұрын

you should be my physics professor!

@mixedguy2038 3 жыл бұрын

I love the way you teach

@ngkean9743 6 жыл бұрын

thk man appreciate

@ModjadjiMamaila-cs4ek Жыл бұрын

U are really a good tutor

@toereh7848 3 жыл бұрын

I’ve learned more from this than 4 months with my teacher

@Physics841 3 жыл бұрын

perfect explanation

@giovannadealca3187 3 жыл бұрын

thanks for it😁

@iron1349 6 жыл бұрын

This stuff makes a TON more sense when you have a calculator to help with finding square roots

@michio028yt8 2 ай бұрын

awsome

@BMitts 3 жыл бұрын

This literally is more helpful than the videos my teacher makes

@tobiiyarou 3 жыл бұрын

i genuinely wanna meet this guy

@anuveersaini7860 4 жыл бұрын

Thank you my good sir

@justinkim4861 7 жыл бұрын

taking the class next year wish me luck!

@codedballs 6 жыл бұрын

Justin Kim good luck

@waffielz3106 6 жыл бұрын

try hard

@jologendary 4 жыл бұрын

can i ask why you multiplied both sides by 2 on the equation of getting the time?

@markkaranja11 3 жыл бұрын

What if we are asked about the horizontal and verticle components of the velocity when the object hits the water?

@aSuspect1 4 жыл бұрын

Thankyou so much

@saihiteshakkineni5113 5 жыл бұрын

This is good

@wenymwila5021 4 жыл бұрын

Physics I see you Thank for the video sir

@stephanieshen3713 4 жыл бұрын

God bless khan academy

@jhelseaamarixe4475 4 жыл бұрын

do we only give a e -9.8 going upwards if it is in free fall?

@elialanaable 7 жыл бұрын

what if we needed to find the total distance?

@aakashsatyavada721 5 жыл бұрын

Thanks

@amarlist1 Жыл бұрын

the sound effects are great, i like Sal, cuz hes prob like super smart af, but this narrator is great too, 1:45

@byehikaveh 4 жыл бұрын

Thank you so much! Im not going to fail my physics test tom

@bla__berries 3 жыл бұрын

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.

@codyclark7525 3 жыл бұрын

bless you sir

@alanjacob1488 Жыл бұрын

Basically use eqns of motion and apply proper sign convention. For other cases too, when projected at an gle theta above and below horizontal

@peppervfx 2 жыл бұрын

My teacher accent is kinda hard to understand so helps out a lot. Thank you.

@ntokozosikhosana-zj5nr Жыл бұрын

What we solving for how far, are we solving vertically or horizontally?

@m4lmas 6 жыл бұрын

5:25 best teacher ever

@malanil1 5 жыл бұрын

lol

@goutomkishordas4687 Жыл бұрын

life saviour

@maki4568 6 жыл бұрын

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 5 жыл бұрын

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 4 жыл бұрын

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.

@alstugvideos 8 ай бұрын

This might sound strange but what software are you using?

@keniatorres5598 5 жыл бұрын

can anyone explain how to do the math portion once he gets to the radical

@adilmohammed6897 4 жыл бұрын

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

@EllietheEngene 3 жыл бұрын

is there a vertical version of this?

@klydeurbiztondo3601 6 жыл бұрын

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 Жыл бұрын

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.