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Stacked Ball Drop

Stacked Ball Drop


check out how high these different balls bounce the basketball the super bouncy ball and the golf ball now I’m going to try the golf ball on top of the bouncy ball on top of the basketball and then I’m going to explain how it’s related to a supernova didn’t you see that probably not so here it is again the golf ball bounced to 28 feet we dropped it from about three and a half feet so it went up 800 percent of its dropped height in fact if you consider that by itself the golf ball bounce is about 70% of its dropped height it went as high as if it had fallen from 40 feet up that is awesome so how can we get the golf ball to bounce up with that much energy let’s simplify it to these two balls when you drop them individually each ball starts out with some potential energy from the height of the drop as the balls hit the ground some energy goes into heating up the ground and some goes into heating the ball because that energy left the ball system you can’t get back up to the same height but when you combine them the tennis ball goes higher than its dropped height way higher where does it get the extra energy as the basketball bounces it compresses storing elastic potential energy as it releases its springboards the tennis ball upward just at the right moment this is like the double bounce on a trampoline when you jump right before someone else you prepare the elastic of the trampoline by stretching it and storing energy which can then bounce the jumper even higher in the same way the basketball stores energy in its compression and is able to push the tennis ball but just like the double bounce preparer the basketball can’t go as high you can see that here it bounces even less when three balls are dropped together also during that transfer of energy some momentum transfers from the basketball to the tennis ball and since the basketball starts with way more momentum because of its larger mass the tennis balls velocity increases by a lot and it flies up up in a way now back to the triple super ball bounce now you get the energy from the basketballs bounce being transferred into the bounce of the super bouncy ball which is then transferred to the golf balls bounce you put the same amount of energy or momentum from two more massive objects into a smaller object and it will go much faster epoch just like the explosions of a supernova which may seem unrelated but what we just did is analogous to the process that occurs during the explosion of a supernova just like our more massive basketball transfers momentum to the smaller balls energy from the dense core of the supernova is transferred in a shock wave that moves through the star to the less dense layers and accelerates them outward at a super high velocity more massive or denser layers in the core of the supernova begin to collapse when fusion stops there the collapse is halted when the neutrons in the core actually touch sort of this causes the implosion to rebound and bounce outward you end up with a dense core left behind and these wild outer shells of star exploding outward pretty cool and of course if you try this at home which you should you have to make sure the balls are perfectly vertically aligned because any off centeredness gets amplified by the two points of contact which is why we sadly couldn’t get the quadruple Tower of balls to work but if you put a little ring of hot glue or something similar on the balls it helps to balance them have you physics seen

100 comments

https://www.physics.harvard.edu/uploads/files/undergrad/probweek/prob1.pdf
I solved this problem some days ago and then found this video!

I tried this but my neighbor got hurt. Too much velocity on the third ball….. Had it been faster, it could have penetrated through his body.

Which technically means, another Black Hole.

I would just like to tell you that I absolutely love your videos! I use them all the time in my classroom!!!

Now, that's a great video. Excellently produced and explained. Big Bang, expanding universe theory; so many applications. Very nice.

Supernovas actually lose a bunch of energy to the higher fusion they do, and they still have plenty of energy to send matter out at relativistic speeds.

Your videos remind me of a book of Jearl Walker I read at the time… but in a much more lively and appealing way :-). Thanks for your effort and time

hi physics girl ,I am a taiwan physics teacher . Can I create a qrcode in my book to connect to you video,let my students to see your vedio? Thank you so much,and forgive my poor English

I feel like I missed something and about to mess up my question: why is the golf ball's max height (28 ft) more than the max height of each of the 3 balls individually combined (3ft + 3ft + 3ft = 9ft)? Is the air friction that great bouncing up? And/or the transfer of potential energy that efficient? Thank you.

Fun fact. In a supernova, much of the outward momentum that causes the explosion of the star is carried by neutrinos. But neutrinos almost never interact with atoms. If you fire a neutrino through lead, you need 1 light year of lead to have a 50% chance of an interaction with the lead. Yes, 1 light year… they don’t like interacting with other matter.
So this gives you an idea of how many neutrinos are created during a supernova, but also it tells you just how dense the material in the star’s core is that many of the neutrinos actually do interact. The “wall” of collapsing stellar material is so incredibly dense that the neutrinos just can’t help hitting it and repelling it outwards.if you want to know more, I recommend the Crash Course Astronomy course with Phil Plait. It’s epic 🙂

I wonder if you sprinkled a little salt or fine sand where each ball touches they would stay in place longer and then you can do the super duper quadruple bounce. I can watch her bounce balls all day…

damn i love your channel and i understand everything u say <3 <3 like pls can someone not call me a crazy nerd for loving physics so much?

I've watched a few videos now where you've talked about something bouncing, and you only ever mention energy lost to heat, but you don't mention sound. If you ask me, I'd say that explaining the loss of energy to sound is a lot easier for a person to grasp, since you can dribble a ball for a few minutes without noticing a change in temperature.

so what would happen if you used two basketballs and one tennis ball would it still go higher or would is have a different out come

Just once, I'd like to see you do the math on a board during the narration of one of these types of videos. Your videos are far more interesting than that but these equations can really be detailed and are interesting to see.

That is essentially what we do with rocket stages. The bigger engines on the bottom go less than a quarter of the total distance, when they separate from the rocket. Even if you have the exact same engines on all the stages.

@Physics Girl, I know this video is over 3 years old now but you best be wearing sun glasses outside. Can't have any more "ultraviolet catastrophes"

So grateful for this video. I've tried a number of ways to describe and demonstrate this process for my students. This video was golden. Keep up the great work!

My balls,
much-more bounced as after seeing her… 😂😇😈
BTW,
very nice explanation of transfer of momentum… 👍👍👍

What happens when you put the larger ball on top and the smaller ones below it? Would it be the same that the ball on top will bounce higher than the ball below it?

How come when the basketball is left out in the sun, it's heated up and gets more bounce and then gets cold and loses Bounce?

its basically asparagus staging in KSP , many boosters all pumping full torwards the inner most booster so when the outermost boosters are emtpy drop em off and the rest of the rockets are still full. except instead boosters balls and instead of fuel the stretch of the ball outwards from hitting the ground, so as the bottom ball bounces up its still applyimg force into the next ball up pumping the next ball full of energy until that energy is enough that the next ball pushes itself off of the bottom ball and the process repeats for each ball going upwards

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