Commentaires de l'utilisateur ayant mis en ligne la vidéo (udiprod)
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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
Tous les commentaires (135)
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@JSimm87 Haha I hope you're joking. How do you think orbit works?
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@preparation88 Hah I can honestly say I've never seen a toilet bowl designed so that the water rotates! Maybe one day after we discover electricity or the wheel down here we can bask in the satisfaction of swirling toilet water!
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7 people could not understand this video and got frustrated lol
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True story: I was in Australia in 1988, on a 3 day camping trip with a couple of seppoes, one was a paratrooper/green beret type. We got to discussing the 'toilet bowl' rotation subject (some of us didn't know you needed better conditions) and the seppo said: "gee, I flush the toilet in the Southern Hemisphere and I see no rotation at all" due to the different designs of common toilets down under.
Not that it proves anything, but when the guy said, "America is a white country" we all just :)
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dont the guys at the american sniper school practice this or something?
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WoW!
What an excellent graphic demonstration.
As a teenager, I often though of my "spiro-graph" toy when trying to visualize these forces. But this video, especially the vector arrows from different references, makes it much more intuitive!
Excellent work! This should be standard scholastic video curriculum!
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At the Richmond Science Museum they have a massive pendulum that moves in the same spiral pattern that tells time by knocking down a peg every few minutes arranged in a circle. Nice to see a visualization of how coriolis does this, thanks.
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Just so you know guys... centrifugal force and the coriolis effect are all a bunch of BS. They don't exist. Their fake.
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thumbs up if this made u dizzy
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In this case, v would be of constant magnitude in constant direction, and so would w, thus making a_cor a constant. Am I right, and are you thus using another frame of reference than the world frame, or am I wrong?
I could really use some help on this, don't just tell me I'm wrong if I'm wrong, but please correct me if I'm wrong.
@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)
doesn't the canon gives the cannonballs a beginning horizon speed?
@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.
Nice, but there is no such thing as centrifugal forces. See Centripetal force on wikipedia for the correct physical force.
The centrifugal force like Coriolis force is an imaginary force. If you anaylze a system from a rotating frame of reference the usual physicals with its real forces such as the centripetal force will not suffice to explain what you see. Adding these two imaginary forces will fix that.