I bought these enormous ball bearings from this guy. They're fantastically heavy. When you whack them together you get a lovely sound. But for that brief moment and in that small space you also get really high temperatures and you can easily burn holes in paper. Here's a video:
You can even smell it! Here's a close up:
Tags: Science
Hello, I am doing a research on the phenomena, can you plz give the information about the weight of the steel balls and perhaps the velocity? Thank you very much!
Hi Wesly, I’m not sure about the velocity but the balls are 60mm in diameter. So that’s 0.03m radius. So the volume is 4/3*pi*0.03^3 = 0.13×10^-4 m^3. The density of steel is about 7,500 kg/m^3.
So the mass is just those two multiplied together 0.13×10^-4 * 7,500 = 0.85kg.
The weight is just the mass times the acceleration due to gravity (9.8m/s^2) = 8.3 Newtons