Dan Burns
@the-physics-well.net
Physics Educator, Space Enthusiast, Astrophotographer
https://the-physics-well.net/
https://the-physics-well.net/
Arbor Scientific used to sell them. They worked OK but I doubt they would work for 2D collisions well but it might be worth trying. You can find them if you search "mini hover puck".
November 20, 2025 at 4:50 AM
Arbor Scientific used to sell them. They worked OK but I doubt they would work for 2D collisions well but it might be worth trying. You can find them if you search "mini hover puck".
Understand. I think once you are doing 2D momentum they have seen that you have to take the mass into account. It would be nice if you could add mass to the hover pucks but they barely levitate themselves as it is. I wonder if you could reduce their mass by removing bits of plastic and foam.
November 20, 2025 at 1:13 AM
Understand. I think once you are doing 2D momentum they have seen that you have to take the mass into account. It would be nice if you could add mass to the hover pucks but they barely levitate themselves as it is. I wonder if you could reduce their mass by removing bits of plastic and foam.
Just because the masses are the same doesn't mean it isn't conservation of momentum. I have never uttered the phrase conservation of velocity.
November 20, 2025 at 12:37 AM
Just because the masses are the same doesn't mean it isn't conservation of momentum. I have never uttered the phrase conservation of velocity.
I will be there. I am conducting a workshop Saturday morning and an interactive session Monday morning. I arrive Friday afternoon and leave Tuesday morning. #ITeachPhysics @aapthq.bsky.social @ncnaapt.bsky.social
November 19, 2025 at 6:00 PM
I will be there. I am conducting a workshop Saturday morning and an interactive session Monday morning. I arrive Friday afternoon and leave Tuesday morning. #ITeachPhysics @aapthq.bsky.social @ncnaapt.bsky.social
I reached out to Matt Blackman and he assures me the universeandmore.com website is safe to use and he is still actively maintaining it. He can't be expected to own the similar domain names. I will continue to recommend it to other teachers but mention to watch out for the "the". #ITeachPhysics
Universe & More
Educational physics games and learning resources designed to build your intuition for physics concepts. Learn about kinematics, circuits, and forces with immersive games based on lessons from award-wi...
universeandmore.com
November 19, 2025 at 5:33 PM
I reached out to Matt Blackman and he assures me the universeandmore.com website is safe to use and he is still actively maintaining it. He can't be expected to own the similar domain names. I will continue to recommend it to other teachers but mention to watch out for the "the". #ITeachPhysics
But still wearing shorts
November 19, 2025 at 3:21 PM
But still wearing shorts
Isn't the word "exactly" somewhat redundant? I think "during" would be a better choice instead of "for". You left off the period.
November 18, 2025 at 11:32 PM
Isn't the word "exactly" somewhat redundant? I think "during" would be a better choice instead of "for". You left off the period.
This is the solution to the hypothetical (as of today) reply to Frank Drake's Arecibo Message. The message is in John L. Casti's excellent book, Paradigms Lost. As far as I know, he didn't copy it from a real alien transmission. Try challenging your students to decode the binary message.
November 18, 2025 at 6:49 PM
This is the solution to the hypothetical (as of today) reply to Frank Drake's Arecibo Message. The message is in John L. Casti's excellent book, Paradigms Lost. As far as I know, he didn't copy it from a real alien transmission. Try challenging your students to decode the binary message.
Good catch, I didn't notice the the. Matt works at PhET. I will let him know about the fake site, I am guessing he already does. I am sure www.universeandmore.com is fine.
Universe & More
Educational physics games and learning resources designed to build your intuition for physics concepts. Learn about kinematics, circuits, and forces with immersive games based on lessons from award-wi...
www.universeandmore.com
November 18, 2025 at 1:46 AM
Good catch, I didn't notice the the. Matt works at PhET. I will let him know about the fake site, I am guessing he already does. I am sure www.universeandmore.com is fine.
Didn't work in all 3 of my browsers. Oh no, the Universe is down! I don't think we can just turn it off and then back on again.
November 17, 2025 at 8:31 PM
Didn't work in all 3 of my browsers. Oh no, the Universe is down! I don't think we can just turn it off and then back on again.
Turns it it wasn't an alien! It was some SOFIA swag from the great people at the NASA Astronomy Activation Ambassadors program. I will distribute it to the teachers at the next PTSOS.org workshop. science.nasa.gov/sciact-team/...
November 17, 2025 at 5:36 PM
Turns it it wasn't an alien! It was some SOFIA swag from the great people at the NASA Astronomy Activation Ambassadors program. I will distribute it to the teachers at the next PTSOS.org workshop. science.nasa.gov/sciact-team/...
At my 39 N latitude, green is usually seen as a low glowing fringe in the distance. On 11/11 it was more dynamic as this time-lapse video using 4s exposures shows. I think it is a strong substorm that must have been amazing for those to my north. It is reflected in the lake. #astrophotography
November 17, 2025 at 5:31 PM
At my 39 N latitude, green is usually seen as a low glowing fringe in the distance. On 11/11 it was more dynamic as this time-lapse video using 4s exposures shows. I think it is a strong substorm that must have been amazing for those to my north. It is reflected in the lake. #astrophotography