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At Viral Gyro Drop & # 39; Ride was fake. Here's how to tell



When this very popular video video made the rounds of social media, the average comment was like this:

WHAT! That amusement park is CRAZY! I would never ride it.

Don't worry. The video is fake. It's a smart fake, but it's actually fake. Yes, there is a real trip called Gyro Drop, but it doesn't do the crazy stuff. But just because a trip is fake doesn't mean we can't analyze it. So what does it feel like riding this fake trip?

I'll start with a video analysis to get the position vs. time data for people on this trip (I assume they would also be false people). The idea is to look at the location of an object in each frame of the video. It can be a bit boring, but I use this amazing (and free) software Tracker Video Analysis. Oh, I need to know the size of something in the video. It seems that the true Gyro Drop is 70 meters high. It will at least give me a rough approach to my analysis.

There are three parts of this crazy trip I want to look at. The first part has the seats, which all move up the tower, and then individuals fall onto a wire. Here is the movement of just one of these people during this part of the trip.

Rhett Allain

It is actually strange (and of course false) that as soon as humans are released from the platform, they begin to move down. If the platform moved up (it was at a speed of about 11 meters per second) then humans should still move up as they "fall". Anyway, I measure the acceleration with a waveform anyway. This squares that part of the movement with a downward acceleration of about 47 meters per second. By comparison, the acceleration of a lost object would be 9.8 m / s

 2 . That means there should be some sort of rocket that pushes these people down. 

Wait! On the way down, man moves at a speed of approx. 18 m / s. Then at the end of the line they are retracted at a speed of 16 m / s (about the same as down). This change in speed (from down to up) occurs over a time interval of approx. 0.2 seconds or less. It would set the stop acceleration at 170 m / s 2 or about 17.3 g s. Note: Fighter jets draw approx. 9 g for very short periods.

OK, now for the next part of your wonderful trip. The people are spun around in a circle. The angle of the cables from the vertical axis is approx. 50 degrees (but they are not all the same) with a cable length of approx. 19 meters (again they are not all the same). By watching the video, it takes about 4 seconds to make a complete tour.

As these riders (or captured riders who cannot fly now) move in a circular path, they are accelerated. The acceleration level depends on both the circular radius and the rotational speed. Based on the above values, one guy I had measured would have a circular acceleration of 35.9 meters per second. Second square or approx. 3.7 g s. I have no real values, but I have the feeling that this would be the highest acceleration for a swinging world trip.

But right from this circular swing thingy you can see that the trip is false. It turns out that for a ball (or human) swinging in a horizontal circle, there is a relationship between the rotational speed, the length of the cable and the angle that the cable does. You can read all the physical details of this older post-it even contains a gif. So if I use the length of 19 meters at an angle of 50 degrees, it must take the human 7.6 seconds to make a complete trip - not just 4 seconds. BOOM. It is false.

Now for a final analysis. At the end of the trip, all people are drawn back to the moving ring on the tower. This ring then accelerates downwards (in the same way as the correct GyroDrop). Here is a plot of the position of this ring as a function of time from the video analysis.

Rhett Allain

It is actually much smoother than I had expected. But you can see that by adapting a parabola to this data, this parabola is the same as the following kinematic equation (for moving an object with constant acceleration).

Rhett Allain

The concept of front t 2 for the fit should be 1/2 acceleration. This puts the acceleration at the beginning of this 74 m / s ^ 2 drop - it is even greater than the downward acceleration at the beginning of the fun ride. Gravity alone will not cause this kind of acceleration. There should be an external force that pushes down on the moving ring. But it also means that there will be a downward force on each of the riders - a force equal to more than 6 times their weight. I don't think it would make them very happy.

Oh, what about the stop at the end of the ringdrop? This has a slightly lower acceleration. Only 6 g are. Everyone should be happy that it is not as bad as the acceleration from the first part. Oh, maybe they already went out - or worse. Good thing, the trip is fake.


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