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How fast does glass crack ?

The Slo Mo Guys attempt another intriguing slow motion experiment in their back yard.


Recent comments on this video
Comment icon #1 Posted by freetoroam on 31 December, 2018, 14:32
Sorry is it their "cool" camera they are showing,  as i can not see the point in cracking glass. What is the point in that? 
Comment icon #2 Posted by joc on 1 January, 2019, 11:32 is exactly their 'cool' camera.  So, they fast does glass break.  With the timer on their camera they found that a sheet of glass breaks at 1458 meters per second...3262 Miles per hour ... Mach 4.2.   And it's kind of cool to watch things in super slow motion...they do all kinds of crazy things like is why they are the Slo-Mo Guys. Possibly a guy thing because...all guys are little boys...and all little boys like to break stuff for fun.
Comment icon #3 Posted by freetoroam on 1 January, 2019, 16:21
I believe you are right, its a boys thing. My husband does things like this and i can never see what it achieves, apart from the boys and their toys thing.  I did try to get him to do the washing up by explaining how much "fun" it can be, he broke 2 dishes, i think he did it deliberately, he is no longer allowed to do the washing up. It back fired on me. 
Comment icon #4 Posted by Piney on 8 January, 2019, 16:19
People yes, stuff no. 
Comment icon #5 Posted by Ozymandias on 9 January, 2019, 10:45
Really interesting experiment. As stated in the video, nothing in nature travels at Mach 4.2!  It would be equally interesting to investigate the speed and pattern of crack propogation in other materials: e.g. ice, ceramic. Also, how about the speed of electricity along a conducting wire?

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