Відео

BUT I guess you must admit that if somehow (presumably via an electronic control ) the ball bedisconnected to the string at the very point of it's attachment to the string, we are back with answer b, aren't we?

the 3blue1brown of physics 😍

Very cool but definitely a trick question ;)

boyz having fun!

Oh my god the ball goes into a circular motion when you rotate it 🤯

A good summary would be to say that releasing the string <> releasing the ball. The ball isn't released until the tension wave reaches it and therefore continues its circular motion.

Wonderfully beautiful

It seems like the mass travels tangentially to not the exact release point, but the tension release point, which makes complete sense. Great video.

How about inertia, your conclusion debunked Newton low of motion

For some reason only a couple minutes in I thought about the planets and how itd take gravity time to "stop" if the sun disappeared, so for 7 minutes after the string of gravity was released earth would still orbit the sun

Can you imagine being on that moon when it takes a corner lol

What a stupid video.

My answer to the spinning ball question, was that it was neither a b nor c, but roughly halfway between a and b

I think you just made me understand why the Scrambler at a carnival feels the way it does. Great video!

Your wrong I can prove it. Your explanation is not the same simulation as your initial description. I can de bunk your answer. You got it wrong

This experiment is not correct there is an additional reason for the ball to follow circle motion. Nobody picked up on the real reasoning for these actions I’ll be glad to explain at any time.

What path does the ball takes when the ball is released at the point the string is attached to the ball?

I was considering the ball being released from the end of the restraining force. Adding another body does make it a different problem.

Tell that to a slingshot master.

the answer will be B, if u release the ball only, right?

A. the *key phrase* in the question that is posed in this video is "release the string." B. the string can be construed to be 'released' in two different ways, as described in (1) and (2) below: (1) if you 'release' the string by snipping it at the center of the circular motion, then you get the 'slinky effect,' i.e., the object continues to execute its circular motion for a finite duration of time after the release of the string. (2) if you 'release' the string by snipping it at its point of contact with the object that is in circular motion, then you get the 'slingshot effect,' i.e., immediately after the release of the string, the object interrupts its circular motion, and starts moving along the tangent vector at the point of string's contact with the object.

If the string is heavier than the ball, then the result looks different. Due to the inertia, the ball would then bump with momentum of the heavier string in the direction C)...and after a short time, the tangential force would act in the direction b), so that at the end the ball would continue to fly along a resulting one between c) and b)...however, an experiment would have to confirm this

The position of the puck is not on the perimeter of the circle and it does not follow the path drawn for answer a. It goes outwards and curves

In the case of the object on the turntable there is still some acceleration towards the centre because the sliding friction is not zero. A better experiment would be to swing an object at the end of a rigid rod (with a cable inside that operates a release mechanism). In such a case I believe the motion after release would be tangential to the circle, as Newton’s first law predicts.

So this is why all the questions in the book said the string was inextensible.

Holy technicality Batman! But cool video. Point taken. And thanks as well.

... the way he explains it, is "fake news".

the center of mass is moving. this is like a capacitor that stores energy. this is not the intended experiment. but artfully nice.

Your question is not correctly defined for a definitive answer. Understandably physicists can only partially answer your question with correctness. Your hand in reality is moving so what you say is a circle that you swing the ball in is not correct. You don't correctly describe reality or a definitive scenario.

Who thought c was wrong?

stop making people crazy with simple things first let's calculator the weight of spring & ball. ounce the spring is off the line it's weight is on other direction than we notes a change

string doesn't have a weight it's different & it can balance because of it's weight. by test these two you shall see the difference between

When an exam like question is presented, it is always presumed that all conditions are ideal unless otherwise stated. Had you stated the non-ideal nature of "the string", the answer would have been obvious. Consider integral calculus. As the propagation speed along the string increases, the arc-time of the ball decreases. In other words, as the string propagation time aproaches zero, the arc-length also approaches zero. Thus, the ball is moving tangentially at any instant in time. The only time the ball will move along the original arc is when that ball is held in place by a radial force. But that was not implied in your original statement of conditions. "When I shit, does my crap fall straight down?" The answer might surprise you! 😅

Beatiful video

I bet one use the deviation from tangent to calculate the speed of that tension wave. Great video!!

Nope nope, I refuse to accept this scientific fact.... I thought b is right, and so shall it be or I'll get emotional damaged, depressed and ill start doing drugs.

The earth continuing to orbit correctly implies that the expansion/contraction of space-time is the “weightless” string that holds us in orbit. When the sun vanishes, space-time re-expansion propagates outward from the now unwarped center. Just as the pre-existing tension in the slinky holds the ball in place until the decompression wave arrives. There is pre-existing gravitational tension between things because they are things. Chew that a bit, then rinse and spit.

For the ball attached to one end of a slinky , a noodle , and a string , as well as for the sun vanishing , in each of those cases it will take a while for the “ news “ of the event of the release or of the sun vanishing to reach the other end . Similarly for a slinky being dropped vertically - but in that case , it really is astonishing how the bottom end remains suspended in space for a measurable few moments ! Never saw or even thought about that before ! Now I’m gonna hafta go and buy one of those slinkys and see this up close for myself !!!

I have to say it again. WOW. 😮 Thank you 😊

Unbelievable. 😮 Thank you so much. 😊

It is a great video, sub for you and greetings from Poland. It seems for me that TENSION in the string do similar job as gravitational force in 4dim spacetime, am I right? :) It is mindblowing!

A "path" followed in an "immediate moment" is a concept that I can not make sense of.

BULLSH** this demo/lecture disregards several basic engineering and dynamics principals. Back to school for the narrator...

Please repeat experiment with a microchip to a trigger attached to the ball. Then the slink. The moment you release the slink on one end let the chip release the slink on the ball end. I bet the ball will fly into path B while slink lingers on for the wave and eventually follow suit.

The reality is that it follows path B. The reason why it continues to follow path A is that effect cannot supersede causality. In other words if the information of release is not arrived to the ball what effect can that have in the ball. Your experiment is best to demonstrate that information does indeed have a mass. It get converted into effect the moment it arrives on intended recipient.

Come to think of it 8 months later, another thing has been left out and it should be mentioned. We are not mentioning the start of the experiment. The ball did not all of a sudden start moving in circular motion. It took some doing for the ball to get to the position of its orbital path, by means of the spring, string or whatever. The ball did not quantum jump from the center of rotation to the position of the orbit. There was a time delay, some doing to get it to move out to where it begins to move in the orbit. So, it takes time at the end for the ball to know that it is released just the same.

Highöy misleading borderline clickbait.

Bravo! Oddly enough, the final example of a disappearing sun sent the bolt home for me. Once you see that as long as the object experiences a force in the direction of the center of rotation, it will continue to rotate, the whole thing comes together. It would have been interesting to contrast this case with that of something rotating by virtue of a force not exerted from the center, but from the outside: a marble spinning within a hoop of some sort. Remove the loop and the marble will zoom out in a straight line immediately, since the force on the marble is lost instantaneously. @pataplan's comment makes the same point as this, I now see.)

There are so many amazing things we find when we look at how physics really plays out over what we think.