Uploaded October 2024 | Updated September 2026, 2 weeks ago
Order Love Triangle now and get a personalised gift tag! https://achievefulfilment.onwarehouse.app/preorders/new?campaign_id=wng5c4y
Or just get a copy with no gift tag. You'll receive it a bit faster. https://achievefulfilment.onwarehouse.app/preorders/new?campaign_id=yx6gcky
There is a small chance we still have limited-edition covers left. You can check here: https://achievefulfilment.onwarehouse.app/preorders/new?campaign_id=w7qzcxw
Thanks to everyone who bought the USA edition! You can still get copies here: penguinrandomhouse.com/books/672455/love-triangle-by-matt-parker
I will send out the book marks soon! I didn't quite get them all done before the video was released.
Huge thanks to David Rankin (R&D Operations Engineer, Catalina Sky Survey, University of Arizona) for discovering Mattparker as well as taking the time to talk to me about it. David's channel: youtube.com/@rankinstudio
Details and data about Mattparker
minorplanetcenter.net/db_search/show_object?utf8=%E2%9C%93&object_id=314159
ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=314159
Search for "314159" on alcdef.org
Here is the Numberphile video: youtube.com/watch?v=n9lKcs-h7fg&ab_channel=Numberphile
Huge thanks to Ilgmars Eglitis (Head of Baldone Observatory, Latvia) for running the extra analysis of Mattparker's light curve and found the approximate rotation period and shape.
"Light curve analysis of main belt asteroids 4747, 5255, 11411, 15433, 17866" degruyter.com/document/doi/10.1515/astro-2022-0227/html?lang=en
This paper contains a derivation of the absolute brightness to size equation.
mathscinotes.com/wp-content/uploads/2016/08/Jackpot.pdf
Asteroid belt diagram based on a NASA image from here: nasa.gov/image-article/picturing-our-solar-systems-asteroid-belt
Cheers to my Patreon supporters for supplying so many great depictions of Mattparker. Support me on Patreon and you can join in with the next ridiculous thing I ask for help with. Also a christmas card. patreon.com/standupmaths
CORRECTIONS
- Yes, I said days instead of hours. But we fixed that with the text.
- Let me know if you spot anything else!
Filming and editing by Alex Genn-Bash
Written and performed by Matt Parker
Produced by Nicole Jacobus
Music by Howard Carter
Design by Simon Wright and Adam Robinson
MATT PARKER: Stand-up Mathematician
Website: standupmaths.com
Order Love Triangle now and get a personalised gift tag! https://achievefulfilment.onwarehouse.app/preorders/new?campaign_id=wng5c4y
Or just get a copy with no gift tag. You'll receive it a bit faster. https://achievefulfilment.onwarehouse.app/preorders/new?campaign_id=yx6gcky
There is a small chance we still have limited-edition covers left. You can check here: https://achievefulfilment.onwarehouse.app/preorders/new?campaign_id=w7qzcxw
Thanks to everyone who bought the USA edition! You can still get copies here: penguinrandomhouse.com/books/672455/love-triangle-by-matt-parker
I will send out the book marks soon! I didn't quite get them all done before the video was released.
Huge thanks to David Rankin (R&D Operations Engineer, Catalina Sky Survey, University of Arizona) for discovering Mattparker as well as taking the time to talk to me about it. David's channel: youtube.com/@rankinstudio
Details and data about Mattparker
minorplanetcenter.net/db_search/show_object?utf8=%E2%9C%93&object_id=314159
ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=314159
Search for "314159" on alcdef.org
Here is the Numberphile video: youtube.com/watch?v=n9lKcs-h7fg&ab_channel=Numberphile
Huge thanks to Ilgmars Eglitis (Head of Baldone Observatory, Latvia) for running the extra analysis of Mattparker's light curve and found the approximate rotation period and shape.
"Light curve analysis of main belt asteroids 4747, 5255, 11411, 15433, 17866" degruyter.com/document/doi/10.1515/astro-2022-0227/html?lang=en
This paper contains a derivation of the absolute brightness to size equation.
mathscinotes.com/wp-content/uploads/2016/08/Jackpot.pdf
Asteroid belt diagram based on a NASA image from here: nasa.gov/image-article/picturing-our-solar-systems-asteroid-belt
Cheers to my Patreon supporters for supplying so many great depictions of Mattparker. Support me on Patreon and you can join in with the next ridiculous thing I ask for help with. Also a christmas card. patreon.com/standupmaths
CORRECTIONS
- Yes, I said days instead of hours. But we fixed that with the text.
- Let me know if you spot anything else!
Filming and editing by Alex Genn-Bash
Written and performed by Matt Parker
Produced by Nicole Jacobus
Music by Howard Carter
Design by Simon Wright and Adam Robinson
MATT PARKER: Stand-up Mathematician
Website: standupmaths.com






![How fast is a bullet? [featuring: pendulum calculation]
Thanks to the Cambridge Engineering Department for building the pendulum.
http://www.eng.cam.ac.uk/
Much appreciation to Maria Kettle and Cambridge Engineering Outreach for organising the day.
http://www.eng.cam.ac.uk/events-and-outreach/schools-and-community-outreach
And Hugh was there.
http://www2.eng.cam.ac.uk/~hemh1/
The Cambridge University Rifle Association were super helpful and let us take over their range for most of the day! Katherine Fleck was our expert shooter with infinite patience.
http://cura.soc.srcf.net/
If you have other suggestions for calculating the speed of a bullet: let me know!
CORRECTIONS
- At 3:17 the close-up shows the sliding box already taped to a piece of paper. I only noticed when uploading that we had used this shot from later in the day by accident. It should have been the shot of the box sliding off the pendulum platform. Our solution to fix this problem was to tape it to a piece of paper.
- A few people have asked why we didn’t use a “chronograph”. We did actually use one which detects the movement of the bullet using infrared sensors. But the .22 bullet was too small to trip them.
- People have commented that we didn’t need to use the equation for the period as we know the length of the pendulum and the value of g. But the period is really easy to measure accurately by letting the pendulum swing for ages. Length could be measured fairly accurately (guessing the centre of mass) but g would require an extra assumption.
- Let me know if you spot anything else!
Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset:
Nicholas Main
Julian Metzler
Amanda Pagul
Christopher Wilson
Claire Greenhalgh
Support my channel and I can make more maths videos:
https://www.patreon.com/standupmaths
Music by Howard Carter
Filming and editing by Trunkman Productions
Sound production by Peter Doggart
Design by Simon Wright
MATT PARKER: Stand-up Mathematician
Website: http://standupmaths.com/
NEW BOOKk: http://wwwh.umble-pi.com
Nerdy maths toys: http://mathsgear.co.uk/ How fast is a bullet? [featuring: pendulum calculation]](https://i.ytimg.com/vi/IoYm8lcJQ0o/mqdefault.jpg)



