Elastic and inelastic collisions | Impacts and linear momentum | Physics

Elastic and inelastic collisions | Impacts and linear momentum | Physics | Khan Academy

Рет қаралды 390,139

Күн бұрын

In this video, David explains what it means for a collision to be elastic or inelastic.
Watch the next lesson: www.khanacademy.org/science/p...
Missed the previous lesson? www.khanacademy.org/science/p...
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: kzfaq.info_...

Пікірлер: 72

@dennsgh 7 жыл бұрын

That ice cream scoop runs faster than me.

@reeturao3043 3 жыл бұрын

😂😂😂😂😂

@erinjohnston5545 7 жыл бұрын

Khan Academy saves my life everytime 👌 But could you please organise your videos into playlists? It makes it easier to find

@somefuckstolemynick 4 жыл бұрын

Check out their website, it’s pretty sweet

@wajiehbadar7656 5 жыл бұрын

This video better save my grades

@Nayan133 2 жыл бұрын

Bollywood & political Khans are spreading dirt but this Khan is really a divine teacher ❤️.

@bimg1915 Жыл бұрын

Wild thing to start off with 💀

@EpicCookie5000 5 жыл бұрын

I remember which is which because elastagirl saves the day (elastic collisions save the KE)

@mat.delpapa 7 жыл бұрын

at 3:11 I love the explanation of molecules.

@eshah3895 4 жыл бұрын

Excellent explanation, thank you.

@sarahholland5980 5 жыл бұрын

some parts have some extra digression that doesn’t feel super relevant (eg: explaining the kinetic movement of molecules- nice to know but not necessary) but the rest is sooo well explained. i really appreciate that you differentiated the definition of an elastic collision with an object “bouncing” because i assumed if an object bounced it was elastic! also appreciate you differentiating a perfectly inelastic collision from an inelastic collision. thank you so much for clearing this all up!

@SaeedKhan-ie3pe 4 жыл бұрын

Best example for explaination

@guntergunter2114 Жыл бұрын

Damn .45 kg that's a heavy scoop of icecream that's almost a whole pound of icecream

@KeenestObserver 3 жыл бұрын

Wonderful explanation. This guy was reading my mind throughout the entire video and answering my questions before I could even ask them.

@a.raza14 4 ай бұрын

you were under his genjutsu all along

@avinashgoswami7972 7 жыл бұрын

you guys are doing it greatly..

@1Reevee 6 жыл бұрын

Is there a way to tell if the collision will be elastic or inelastic before the actual collision with just the given momentums

@sonugupta5326 5 жыл бұрын

Nooooo

@SublimeSyr 7 жыл бұрын

Love you guys. Thank you once again!

@thutopole3187 Жыл бұрын

smooth🏅👏

@eduugr 7 жыл бұрын

Great! Fantastic explanation!!!! Thank you VERY much !!!!!!!!!!!!!!!!!!!!!!!!!!

@atahaninal6952 6 жыл бұрын

boii..give this guy an ice cream !!!

@1992Dadi 7 жыл бұрын

thanks khan academy !!!!!!!!

@dhruvabhat3261 3 жыл бұрын

Rumal Mahindaratne D,d,d

@psun256 3 жыл бұрын

So on a hard surface, a steel ball bounce would be more elastic than something like rubber right?

@abdulmuqsitnajm3430 4 жыл бұрын

Khan academy is the best. It always helps me earn good marks in my tests. Keep it up.

@micahbelocura1190 3 жыл бұрын

can i ask something? is it possible that totalk kinetic energy is conserved but momentum is not? if yes under what circumstances would it be?

@mangojuice5319 Ай бұрын

maybe in uniform circular motion? the direction of velocity keeps changing but the magnitude of velocity remains constant

@mjd_13 5 жыл бұрын

I'm getting sleepy watching this 😂

@san99972 6 жыл бұрын

sir you just said that initial KE is greater than final KE in inelastic collisions. But in this example it was smaller. Why?

@mohitsoni8296 6 жыл бұрын

Safia Gangar initial was 46.5 J and final was 5.96 J

@mujtabamujeeb786 6 жыл бұрын

KE initial is bigger than the final. watch it again

@srinivaspolisetti3239 6 жыл бұрын

Safia Gangar I love you please marry me. I am in America today. tomorrow I will come to your house

@mujtabamujeeb786 6 жыл бұрын

srinivas polisetti lmfao wut? Get outta here. You perv

@mujtabamujeeb786 6 жыл бұрын

dude i feel like giving you a kiss it never clicked what "conserved" mean was until now

@skzbokxo62 5 жыл бұрын

what do u mean by perfectly inelastic collision?

@Cryptosonix 4 жыл бұрын

basically the two objects "stick together" after colliding...

@reggiedunsdon6457 Жыл бұрын

why do two things sticking together imply a collision is perfectly inelastic? also if inelastic means kinetic energy is not conserved, so only a fraction of original kinetic energy remains after the collision. would a perfectly inelastic collision not imply after the collision there is no kinetic energy ? and thus no velocity?

@arshadqadir7510 4 жыл бұрын

Sir..Kindly tell me...What are the conditions of elastic nd inelatic collision?

@Grimwood_ 7 жыл бұрын

*throat clear* SketchBook

@pkdheekshitha37 4 жыл бұрын

Awesome af

@joeyw20 5 жыл бұрын

under what circumstances would anyone throw a scoop of ice cream at a basketball

@Phantom-ks2pv 3 жыл бұрын

How did you get that accent

@irfanurrahman3796 3 жыл бұрын

Isn't gravitational attraction force rather than electromagnetic force between the small ice creams? 🤔🤔🤔

@noahjanitza4518 5 жыл бұрын

The collision is obviously inelastic BUT the when he proved that that was the case he only found the change in KE of the basketball, not the entire system. The basketball could have given most of its KE to the ice cream scoop and therefore the KE of the system may have been conserved.... Does anyone else see this? or am I totally off?

@jenniferrivas1039 4 жыл бұрын

it’s not just the basketball because he takes account everything the ice cream is doing

@ksdnsdkumar1375 5 жыл бұрын

@10:32 Sound waves requires energy? I though sound waves need pressure waves.

@yoshida_chad2393 11 ай бұрын

doesnt some energy goes into friction too?

@raphieI 8 ай бұрын

Energy is lost in various ways, but when we solve questions we ignore them.

@bbgr9239 2 жыл бұрын

Jesus Christ loves you 🥺

@niahl8orxd4 3 жыл бұрын

thats a wham scoop of ice cream ngl

@rijabakhtawar8197 6 жыл бұрын

Am I the only one who doesn't get this? The ice cream scoop example is kinda confusing me..

@MunkyChunk 5 жыл бұрын

How so?

@jenniferrivas1039 4 жыл бұрын

Every time he says ice cream replace it with baseball. It doesn’t really matter what it is. The point is that something bigger collides with something small

@youngkoh9127 6 жыл бұрын

If the ice cream and basketball start off going in two different directions, shouldn't the energies cancel instead of add?

@alexbensen2821 6 жыл бұрын

No. If two things go in opposite directions, one of their velocities is negative while the other one is positive. However, with Kinetic Energy, the velocities are squared (1/2mv^2), making all of the negative velocities become positive. Hope this helps, even though you asked this question 4 months ago :)

@sonugupta5326 5 жыл бұрын

ENERGY is a SCALAR quantity .... it doesnt cancel out