https://eitaa.com/langoage مارا به دوستان خود معرفی کنید🎀💞

https://eitaa.com/langoage مارا به دوستان خود معرفی کنید🎀💞

https://eitaa.com/langoage مارا به دوستان خود معرفی کنید🎀💞

https://eitaa.com/langoage مارا به دوستان خود معرفی کنید🎀💞

Normally when you drop a ball, it can't bounce higher than the height it started from due to the conservation of energy — but not this one. Okay, I'll drop it at the table height and it'll go higher than the table. So watch this. Cool. How is this even possible? With a normal ball and a best-case scenario, the highest that a ball can bounce to is exactly the point that it was dropped from. In that case, it would be perfectly elastic with no energy loss — but in real life, with real materials, there's always some energy loss as heat and sound and sometimes plastic deformation. Well, you might have already noticed that this ball looks a little odd. That's because it's actually a balloon with something else elastic inside of it. So what's inside here? With this hollowed-out half-sphere here, we can invert it. This provides a bunch of energy stored elastically in the bulge of the rubber. آدرس کانال تلگرام: https://t.me/LEWM_teachersafari آدرس کانال ایتا: https://eitaa.com/everythinginenglish راه ارتباط با ما: @Marzieh_Safari

Hello girls

Hi everyone, sorry I didn't say goodnight last night; I've been really busy.