Roger Freedman
@rogerfreedman.bsky.social
Physics educator at UC Santa Barbara, textbook author, and San Diego Comic-Con OG. he/him/his
"...a legacy of political rancour and racial hatred so intense that no explanation of the causes of the Second World War can stand without reference to those roots." (John Keegan, The First World War)
Lest we forget. 2/2
Lest we forget. 2/2
November 11, 2025 at 3:13 PM
"...a legacy of political rancour and racial hatred so intense that no explanation of the causes of the Second World War can stand without reference to those roots." (John Keegan, The First World War)
Lest we forget. 2/2
Lest we forget. 2/2
Commemorating the 107th anniversary of the end of the First World War—an unnecessary and tragic conflict that killed millions, "tortured the emotional lives of millions more, destroyed the benevolent and optimistic culture of the European continent and left... 1/2
November 11, 2025 at 3:08 PM
Commemorating the 107th anniversary of the end of the First World War—an unnecessary and tragic conflict that killed millions, "tortured the emotional lives of millions more, destroyed the benevolent and optimistic culture of the European continent and left... 1/2
November 7, 2025 at 5:25 PM
The first (1955) Danish edition of Ray Bradbury’s FAHRENHEIT 451. Later editions did not convert the title, so this is the only SI-compatible edition! 🎢
November 1, 2025 at 7:55 PM
The first (1955) Danish edition of Ray Bradbury’s FAHRENHEIT 451. Later editions did not convert the title, so this is the only SI-compatible edition! 🎢
The 747 model was quite nice!
October 20, 2025 at 1:10 PM
The 747 model was quite nice!
For these students, education seems to have reverted to the 14th century, with only the lecturer having a copy of the precious book…
October 6, 2025 at 8:24 PM
For these students, education seems to have reverted to the 14th century, with only the lecturer having a copy of the precious book…
And there is indeed an OpenStax high school physics textbook: openstax.org/details/book...
October 6, 2025 at 7:22 PM
And there is indeed an OpenStax high school physics textbook: openstax.org/details/book...
I always like following up the discussion of this problem with a multiple-choice question...
October 5, 2025 at 4:26 AM
I always like following up the discussion of this problem with a multiple-choice question...
On October 4, 1957 the first Earth satellite, Sputnik 1, was placed in orbit and the Space Age began - as did the space race between the USSR and USA. #space #spaceage #spacerace #sputnik #sputnik1
October 4, 2025 at 6:03 PM
On October 4, 1957 the first Earth satellite, Sputnik 1, was placed in orbit and the Space Age began - as did the space race between the USSR and USA. #space #spaceage #spacerace #sputnik #sputnik1
Great news for comics fans and San Diego Comic-Con enthusiasts: Now in production, the film EVERYONE IS INVITED: WELCOME TO SAN DIEGO COMIC-CON will present the Comic-Con story as never before, including tons of never-before-seen archival video and film! #sandiegocomiccon #sdcc #comics #comiccon
October 2, 2025 at 9:22 PM
Great news for comics fans and San Diego Comic-Con enthusiasts: Now in production, the film EVERYONE IS INVITED: WELCOME TO SAN DIEGO COMIC-CON will present the Comic-Con story as never before, including tons of never-before-seen archival video and film! #sandiegocomiccon #sdcc #comics #comiccon
THE FLINTSTONES premiered on television sixty-five years ago on September 30, 1960. Happy anniversary! #flintstones #tv #animation #lospicapiedras
September 30, 2025 at 1:29 PM
THE FLINTSTONES premiered on television sixty-five years ago on September 30, 1960. Happy anniversary! #flintstones #tv #animation #lospicapiedras
The romance of physics. 🎢
Illustration by Gardner Rea (1884-1966).
Illustration by Gardner Rea (1884-1966).
September 29, 2025 at 12:15 PM
The romance of physics. 🎢
Illustration by Gardner Rea (1884-1966).
Illustration by Gardner Rea (1884-1966).
It seems wrong that the Trump+Epstein “Friendship Statue” was taken down from the National Mall after just one day, since clearly it was just meant as an illustration of Newton’s 3rd Law! (Second image is Figure 8-20 from Young and Freedman, University Physics, 16th edition.) 🎢
September 24, 2025 at 2:32 PM
It seems wrong that the Trump+Epstein “Friendship Statue” was taken down from the National Mall after just one day, since clearly it was just meant as an illustration of Newton’s 3rd Law! (Second image is Figure 8-20 from Young and Freedman, University Physics, 16th edition.) 🎢
A note to the farmers in Arkansas complaining about the effects of Trump’s tariffs:
During Trump's first trade war, farm bankruptcies went up 24%.
This was your sign.
You ignored the sign, and the vast majority of you voted for Trump nonetheless.
This is a problem YOU created.
During Trump's first trade war, farm bankruptcies went up 24%.
This was your sign.
You ignored the sign, and the vast majority of you voted for Trump nonetheless.
This is a problem YOU created.
September 10, 2025 at 1:29 PM
A note to the farmers in Arkansas complaining about the effects of Trump’s tariffs:
During Trump's first trade war, farm bankruptcies went up 24%.
This was your sign.
You ignored the sign, and the vast majority of you voted for Trump nonetheless.
This is a problem YOU created.
During Trump's first trade war, farm bankruptcies went up 24%.
This was your sign.
You ignored the sign, and the vast majority of you voted for Trump nonetheless.
This is a problem YOU created.
* Trump will return to his natural physical form to preserve his failing health
September 2, 2025 at 1:24 PM
* Trump will return to his natural physical form to preserve his failing health
Enjoy those Labor Day weekend specials, everybody!
(Via John Fry, from the San Diego Union in 1960.)
#labordaysale #laborday #sandiego #groceries #1960s
(Via John Fry, from the San Diego Union in 1960.)
#labordaysale #laborday #sandiego #groceries #1960s
August 30, 2025 at 1:54 AM
Enjoy those Labor Day weekend specials, everybody!
(Via John Fry, from the San Diego Union in 1960.)
#labordaysale #laborday #sandiego #groceries #1960s
(Via John Fry, from the San Diego Union in 1960.)
#labordaysale #laborday #sandiego #groceries #1960s
Under such conditions sipping might become a challenge - which is one reason why there are no cup holders in a Magister. (My airplane does have cup holders, but I never get above 60 degrees of bank.)
August 27, 2025 at 3:46 PM
Under such conditions sipping might become a challenge - which is one reason why there are no cup holders in a Magister. (My airplane does have cup holders, but I never get above 60 degrees of bank.)
Pilots are well aware that in a coordinated turn, there are no apparent side forces - that’s the purpose of the ball in a turn coordinator (shown below). If the ball remains in the center, there are no apparent side forces and the surface of the pilot’s Chianti stays level. 😉
August 27, 2025 at 3:25 PM
Pilots are well aware that in a coordinated turn, there are no apparent side forces - that’s the purpose of the ball in a turn coordinator (shown below). If the ball remains in the center, there are no apparent side forces and the surface of the pilot’s Chianti stays level. 😉
August 5, 2025 at 12:25 PM
Looking forward to seeing everyone at the @aapthq.bsky.social Summer Meeting! Hope to see you at my presentations (listed below). #aaptsm25 🎢 #ITeachPhysics
July 26, 2025 at 5:11 PM
Looking forward to seeing everyone at the @aapthq.bsky.social Summer Meeting! Hope to see you at my presentations (listed below). #aaptsm25 🎢 #ITeachPhysics
The best advice I can give to high school students interested in
#physics - take an intensive German class. (From physicist Martin Bauer.) 🎢
#physics - take an intensive German class. (From physicist Martin Bauer.) 🎢
July 16, 2025 at 4:58 PM
The best advice I can give to high school students interested in
#physics - take an intensive German class. (From physicist Martin Bauer.) 🎢
#physics - take an intensive German class. (From physicist Martin Bauer.) 🎢
For the #SummerOfSuperman, the story of how I and several of my comic-book-fan pals from San Diego became part of the DC Universe (and opponents of #Superman!) in the early 1970s. (In the second image, that's me at lower left with the goggles and red hair.) 13thdimension.com/oddball-comi... #comics
July 13, 2025 at 9:48 PM
For the #SummerOfSuperman, the story of how I and several of my comic-book-fan pals from San Diego became part of the DC Universe (and opponents of #Superman!) in the early 1970s. (In the second image, that's me at lower left with the goggles and red hair.) 13thdimension.com/oddball-comi... #comics