@udiprod
This is a tricky question that combines physics and philosophy. Classical physics thought that physical laws only apply for a stationary point if view. In this sense, movements observed by a moving observer are not real physical movements, though philosophers may still claim they are real for this observer. Later, Relativity has shown there's no one single stationary point of view, which seem to strenghen a philosophical view that whatever you observe is real enough for you.
@udiprod
Thanks! I use a 3d animation tool called Maya to create all my videos. Reference frames are a basic ingredient in 3d animation tools, and you have a fine control on how they move and/or rotate, so creating such effects is really easy.
@udiprod
Using 'Maya' (3D animation tool)
@jarod997
Wow, that's probably the most easiest to understand example of ficticious forces I've ever seen. Excellent job!
@udiprod
@edansw The important thing is that the balls move in straight lines because no forces act on them. If the cannon was placed on the rim the balls would indeed have another component to their speed, causing this line to be slanted with respect to the cannon at the time the ball is fired, but it would still be straight. However, the cannon is in the middle so even this doesn't happen.
@shrinivasiyengar5799
13 years later it's still useful. Thanks 😁
@3dgar7eandro
Wow 🤯 😲 perfectly explained!
@udiprod
You are right the pendulum returns to the same spot on the disc after 3 periods. However, it completes an arc each time it reaches the center position, i.e, it completes two arcs per period. Check out for example the video at time 1:40 - 1:42.
@want-diversecontent3887
1:44 a nice flower. :)
@ThomasFauskanger
Great visualization. Nice animation. Good job there, udiprod :)
@Emblematic
These are great videos. I've always found the animations and explanations of gravity, orbits and the like as seen in most popular science tv programs to be only half-baked, to be missing something. Like the Solar System always being shown completely in isolation with all the planets doing nice elipses as if by magic. They never add the next, 'higher' frame of reference. Or explain where the momentum originally comes from. This is really good stuff. Thanks for putting it up.
@udiprod
@HosteDenis In a non-rotating frame of reference, the w vector you mention would be zero so Coriolis force is also zero. Therefore Coriolis force only occurs in rotating frames of references. The video shows both: example 1 is first shown in the world (non-rotating) frame of reference, where no forces act on the balls, and then in the disc's (rotating) frame of reference, where Coriolis force bends their path. In example 2 also both frame of reference are shown (follow the titles)
@udiprod
The plate does not affect the pendulum. The video demostrates the differences between points of view. From a point of view fixed to the plate the plate seems stationary and everything else rotates. This effect causes the pendulum to do strange loops and arcs, as if moved by imaginary forces
@Volound
this is amazing and i understand it 10 times as much now
@arestes
nope, centripetal force is a force that makes sure that something moves in a circumference. A centrifugal "force" is a (misleading) term that is not really a force but appears in the equations of motion for rotating frames of reference and it really exists if you want to use your newtonian intuition there
@udiprod
The starting point of the pendulum doesn't matter. Look at the first time the pendulum reaches the edge of the disc. Call that t=0. Let's say the pendulum period's is 2 seconds and the disc's is 3 seconds. At t=2 the pendulum will return to the same spot, but the disc will only complete 2/3 of its rotation. Only at t=6 both pendulum and disc will return to the same configuration as in t=0, after the pendulum has completed three full swings (each swing produces 2 leaf-like arcs)
@themouseinator
Centrifugal force is still a thing. Technically, it's not a force, but mathematically, it is.
@buttegowda
This is best explanation of coriolis force !! I struggled months trying to understand this in classical mechanics by Goldsten book, way back. Thanks for posting this.
@BoyKhongklai
I've known about coreolis for decades, but now seeing it explained for the first time
@musakth5142