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

In this video, David explains what it means for a collision to be elastic or inelastic.

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.

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[denmarcg]

That ice cream scoop runs faster than me.

[erinjohnston]

Khan Academy saves my life everytime 👌

But could you please organise your videos into playlists? It makes it easier to find

[NAYAN-te]

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

[mat.delpapa]

at 3:11 I love the explanation of molecules.

[sarahholland]

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!

[EpicCookie]

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

[KeenestObserver]

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

[mujtabamujeeb]

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

[Reevee]

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

[abdulmuqsitnajm]

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

[mjd_]

I'm getting sleepy watching this 😂

[guntergunter]

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

[san]

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

[micahbelocura]

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?

[reggiedunsdon]

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?

[psun]

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

[skzbokxo]

what do u mean by perfectly inelastic collision?

[arshadqadir]

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

[joeyw]

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

[noahjanitza]

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?