IDTIMWYTIM: Centrifugal Force

In this edition of IDTIMWYTIM, Hank addresses the so-called centrifugal force, and explains why you really mean centripetal force.

References for this episode:

[KainPyrotic]

Wait, was that... outside?  Such a mythical land.

[PhillipTheBrandon]

While I was wasting time quoting, you got around the no-url filter. Brilliant!

[markkaplan]

@Scishow It really depends on what frame of reference you are using, in advanced physics courses, where rotating reference frames are used, the centrifugal force is "real" and does exist.

[larperdoodle]

"As with most things in theoretical physics, Isaac Newton said it first." Love it!

[tymo]

I have taken years of high school and collegiate physics and all my instructors have failed to explain this as well as you have.

[AlexMarie]

I just explained this to my friend a couple days ago! I feel like such a knowledgeable high schooler now :)

[LukaUnempress]

I'm struggling with physics, but these videos give me a comfort. They're so much more digestible. Thank you!

[schoolgirl]

I'm a tutor at a university, and I'm always explaining this to my tutees, but they never believe me... Thank you, Hank - I appreciate this video.

[contingenceBoston]

1:43 -- Pulling it toward the ball, or pulling it toward the pole?

[maxravenwood]

I'm really glad Hank explained this to us, although I'm not sure how I didn't see it until over five years after it came out. . . I learned about centrifugal and centripetal forces on populations (which are exactly what you'd think they are, considering what we think centrifugal and centripetal forces are in science) in my AP Human Geo class and was wondering if there were similar things in science.

[antham]

+lucromel 
To calculate centripetal force: (m x v^2) / r
To calculate centrifugal force: -(m x v^2) / r
Therefore they are equal and opposite. 

[coldarrow]

Oh thank god!!!! That part of my brain that had me doing physics and maths all through school and then onto studying engineering at university is infinitely thankful to you for putting this out there!!

[TheErudite]

Need to an IDTIMWYTIM on Gravity. A lot of people have no clue what it means... 
As well as The Speed of Light :D

[notkyleschultz]

Not picking on hank, but he threw the ball exactly the way I'd picture him throwing a ball. He also surprised me when he caught the ball, not that he could catch it, just his body language doing it. You're an enigma, hank green.

[ZaDowlan]

has anyone else noticed that the letters of the acronym IDTIMWYTIM is incorrect. Hank is saying i dont think "that" means what you think it means. either the second I needs changed to a T or Hank needs to say i dont think "it" means what you think it means.

[Andrew-Comi]

Thanks man. I had several years of college level physics, dynamics, etc. And I don't think this was ever explained to me so clearly

[ArchAngelSlayer]

Is this what happens to space craft in orbit?  Only the string is gravity?

[justinscheidler]

YAY! I asked Vertasium to do a video on this misconception...i didn't see this before. Thank you Derek. Thank you Hank for taking care of my biggest pet-peeve in physics!!!!

[IamGrimalkin]

Wasn't inertia first described by Galileo, if in a less elegant way?

[KingdomOfDimensions]

It is a game involving 2 people in which the object is to wrap the ball all the way around the pole until the rope is wound tight, and the ball stops without bouncing. One player hits it clockwise from a top-down perspective, the other player hits it counter-clockwise from the same POV. There are numerous rules the players agree on before beginning play, resulting in various different game and play styles. It is somewhat similar to swingball, except played with a volleyball and without racquets.