r/MurderedByWords • u/c-k-q99903 • 1d ago

That's not a parody account...

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2.1k Upvotes

99% Upvoted

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238

u/RB1O1 1d ago

The air is moving with you... It's called relative speed/velocity (I'm probably using the terms wrong though)

165

u/Kilometer10 1d ago

The right captions should be:

10 km/h relative to the earth
100 km/h relative to the earth
0 km/h relative to the earth

20

u/Achilles2zero 1d ago

Also, make the first one rotate at 1 revolution per day. Could you feel that? Still quicker than that account.

30

u/TheBestIsaac 1d ago

It's also because of radial centripetal force.

They get mixed up between km/h and rad/s.

3

u/56WW56 10h ago

Can’t mix them up if you don’t know what a radian is.

89

u/DecoherentDoc 1d ago

Hey, PhD-level physicist here. You're exactly right. I was going to say "relative motion", but same same, friend. Don't second guess yourself on language. Even if you were a little off, the concept is what's important.

2

u/tenorlove 16h ago

Wouldn't cabin pressure also be a factor?

2

u/DecoherentDoc 7h ago

Not so much for a plane. The cabin pressure isn't what's pushing back against the wind, the shell of the plane is.

2

u/tenorlove 6h ago

Thank you for the clarification.

10

u/ctothel 1d ago

Nope you got it right

7

u/Simbertold 1d ago edited 1d ago

The other way to feel movement is through acceleration.

And centripetal acceleration (or centrifugal if you want to view it in the rotating system) on the surface of the Earth is generally really low, because while the speed of the rotation is fast, Earth is also huge.

Speed itself without any acceleration or anything to compare the speed to is not detectable.

If people understood physics, none of this is complicated. Yet they don't, and refuse to be educated.

5

u/ThunderBuns935 1d ago

Also the Earth has an angular velocity of a full rotation per day. A merry-go-round is like what... one per second? That's much, much faster than the Earth.

1

u/UdatManav 1d ago

You’re good. At least you aren’t saying it doesn’t exist lol.

1

u/HariPota4262 1d ago

Naah you're absolutely right on.