Curling Stone Impacts at 40,000 FPS (High-Speed Footage)

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Curling stones only come from two places in the world, but what makes them so special? Ever wonder what a curling stone looks like in slow motion? Learn more about Derek's research on curling stones!
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Drone footage provided by:
Tommy Morrison (Ailsa Craig)
RUclips ► / @itstommysworld_
Instagram ► / itstommysworld
Terry Williams (Trefor Quarry)
RUclips ► / @terry1million

[@exploreminerals]

Got any questions about Derek's research on curling stones? Leave a comment below!

[@itstommysWorld_]

Hey buddy! Really interesting video, really well put together, and spoken so confidently and clearly... superb! Can’t wait to see more videos my friend

[@tchevrier]

the high speed was very cool. you can actually see the compression

[@andreperreault4570]

First time I actually see this, Derek. Too bad you’re in your PhD phase back at Laurentian. This is really wild stuff! Show this to the best ice makers and they will start to really reconsider their calling. Next 8s how to deal with the wonderful rock dust! Thanks so much for skipping with Sophie when she needed a spare, it was one of their most entertaining games of the year! Good luck on your doctorate!

[@davidingram353]

This is truly awesome, I know when to rocks are hit together they leave dust and I was sure that curling stones did as well, but to see it actually happen is amazing.

[@jarverm9148]

As somebody who has little interest in curling but a fascination with physics I’m very glad I found tour vid

[@teacher_ash]

Great channel name and video!! Thanks!

[@terry1million]

Very intresting stuff, looking forward to more videos

[@BeeEmRibau]

Great video, thanks Derek!

[@exploreminerals]

Thanks for watching Bridget!

[@BenedictAFindlay]

Could you tell us how much force is exerted during the collision? All the momentum is transferred during that 1/4 millisecond, and the speed & mass of the stone is known, so it should be easy to calculate.
Thank you.

[@exploreminerals]

The calculated force is about 92 kilonewtons (note that a contact time of about 1/2 of a millisecond was used in this calculation as a conservative estimate because it is difficult to see exactly when the collision begins and ends)

[@donvickerson6787]

Can you please please please explain why a curling stone “curls “ and how or if in fact directional brushing works.

[@logicisuseful]

Why it curls is actually a really weird question no one quite knows the answer to (short version is that it usually curls the same direction as it’s spinning, unless the ice is weird or the stone is unbalanced).
Directional sweeping works to some extent - sweeping melts the ice, and changes to the ice can affect path of travel (see the part about “ice is weird” affecting why and how a stone curls), so enough sweeping can change the path of travel. Sweeping mainly mitigates or aggravates the curl the stone is already trying to do (you mitigate by sweeping directly in front of the stone, aggravate by sweeping on more the side it’s beginning to curl toward. It’s possible to get it to actually go the other direction, but you’d have to sweep really hard with a really rough broom (competition-level brooms are actually regulated to specifically prevent that).

[@cowturd9000]

great project and footage!

[@violinsoldier8665]

As a longtime curler... mind blown! They need a ‘love’ reaction ❤️, not merely like.

[@iowa_don]

Awesome. Well Done!!

[@steveosterman2179]

Cool project, although at first I thought it was about Impacts at 40,000 _feet_ per second. That would have been a very different research project.

[@GeologyDude]

The term "granite" is a general term in the stone industry for all coarse-grain granitic rocks. What is the exact type of "granite" and rock unit name for this rock type? I would greatly appreciate this information. Thanks!

[@exploreminerals]

Great question! The curling stones from Ailsa Craig, Scotland are alkali feldspar quartz syenite, whereas the rocks from Trefor, North Wales are quartz monzogabbro to granodiorite/granite. You can watch more about curling stones here: ruclips.net/user/livechgMu3eYj5U?feature=shared. There was also a paper published last year on the mineralogy of curling stones: pubs.geoscienceworld.org/canmin/article/60/1/171/612647/Taking-Rocks-for-Granite-An-Integrated-Geological . Hope this helps!

[@GeologyDude]

@@exploreminerals awesome! Thx very much for your answer!

[@carlosbaez816]

Any updates?

[@flaviabarrosasoares3047]

Did you finish your research?

[@exploreminerals]

Hey, sorry for the delayed response! My paper on the mineralogy of curling stones was published last year, and I'm currently writing up the paper for my MSc work. You can find the mineralogy paper here: pubs.geoscienceworld.org/canmin/article/60/1/171/612647/Taking-Rocks-for-Granite-An-Integrated-Geological

[@WatermanW]

Rad

[@highvalleycowboy1]

Fuck yeah man