Thus neatly making the case that radius matters.
Girth, you say?
One is but a two pi greater version of the other.
I once lived with a sort of science
skepticistdenier (didn’t believe in the moonlanding nor did he believe that the earth wasn’t flat). He was of the belief that scientists are deceiving the public and one of the examples he gave was that they claim that the earth rotates at 1 670 km/h but if we look outside that’s very clearly not the case and if jump we aren’t flung at that speed to the side. I spent half an hour in a back and forth trying to explain the concept of relative velocity and inertia. It didn’t go anywhere.Edit: changed to denier based on the comment by logos.
Ask them to jump inside a train
My aunt once mentioned that if the earth wasn’t rotating that we’d all be crushed by gravity, and it’s only the spinning cancelling out that force. I responded by pointing out that gravity is also present at the poles, where you can casually walk faster than the rotation of the earth, and yet no one has been crushed to death there. She responded that it must be something to do with the magnetic fields, and wouldn’t listen to anything I said when I tried to explain the basic concept of angular velocity.
Have him drop a tennis ball in a moving vehicle. It won’t make him understand but you can at least say you tried.
acceleration is the answer
Yes, and a = v^2/r.
Merry-go-round: small radius, big acceleration!
Earth: big radius, small acceleration.
deleted by creator
Lol, guys it’s not acceleration it’s just the exact definition of acceleration. Which is definitely not acceleration.
We do understand the difference between speed and velocity. It’s just that acceleration is the change in velocity over time, not speed.
Rotation is acceleration towards the center with a velocity perpendicular to the centre. Using a frame of reference that rotates along with the object doesn’t change what is physically happening to that object, it just affects the way you observe what’s happening. A rotating frame of reference is itself accelerating and each of those frames of reference are accelerating.
We don’t feel the Earth’s rotation because gravity is accelerating our entire body and surroundings at the same rate, plus it’s not just the spinning keeping us in equilibrium; the left over force holds us on the ground.
The other two feel different because it’s the structures that provide the acceleration towards the centre, which then pushes on our bodies where it makes contact, and then the structure of our bodies pulls the rest and you can feel the forces of things wanting to move in the direction of inertia but being pulled around the circle instead.
If rotating frames of reference weren’t accelerating, turning a car would feel no different from going straight.
It’s almost like there’s no such thing as absolute velocity or something
Relativity
If you were only going 6 km/h you were doing it wrong
So true
