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Dennis Veasley

100 thoughts on “Stacked Ball Drop”

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

  2. 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.

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

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

  5. 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.

  6. 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

  7. 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

  8. 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.

  9. 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 🙂

  10. 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…

  11. 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?

  12. 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.

  13. 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

  14. 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.

  15. 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.

  16. @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"

  17. 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!

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

  19. 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?

  20. 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?

  21. 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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