Humans deserve to do things. Amazing things. Situation in point: this human, called Aaron Cook. Cook can perform some serious tumbling (just examine out his YouTube channel), however he can additionally do something extremely difficult—a standing dual back tuck (backflip).
You are watching: How to do a double backflip
I have actually two daughters and both room gymnasts, therefore I understand just how complicated this move really is. A earlier tuck is a flip in which the feet relocate forward and the head moves earlier (a front tuck is the specific opposite). The "tuck" part means that chef pulls his legs right into his body together he rotates. If he continued to be in a straight position, it would certainly be dubbed a layout—and it would certainly be super impossible. Last, we have the "standing" part. This way that the does the flip from a standing position. It's in reality much easier to do a twin back tuck if it's part of one more tumbling pass whereby the gymnast builds both energy and also rotation over the course of number of moves.
Why is the standing twin back so difficult? Well, you have to do two really hard points to no crash on her head.
First, you have to jump high sufficient so the you are in the waiting long enough to rotate. An alert how my daughter's facility of mass rises and then moves ago down.
Second, you should rotate—twice. There room two points to helps through this rotation. In stimulate to start the rotation, cook swings his arms. This motion offers him an initial angular momentum. Angular inert is very similar to normal momentum, but instead of being the product that mass and also velocity, angular momentum is the product that "rotational mass" and also angular velocity. The rotational mass (usually dubbed the moment of inertia) counts on both the mass of the object (or human) and also how this mass is distributed. When he is in the air, he traction his legs in close come his body. This to reduce his rotational fixed so that his angular velocity increases.
Here is another method to do a back tuck that is a little bit less complicated (according to mine daughter). In this version, she starts in a handstand. As she moves earlier to a was standing position, she increases her angular inert so the she will rotate quicker once she walk the flipping part.
The truth that Aaron chef can do this standing double back tuck kind of renders him a superhero. Looking in ~ the video, I have the right to measure the time he is in the air through a cave time of around 0.867 seconds. Due to the fact that the vertical acceleration is known (-9.8 m/s2), I have the right to use the typical kinematic equations to do a relationship in between time and also maximum height. If you desire all the details that this calculation, girlfriend can find them in this larger post.
With this hang time, Aaron chef jumps a height of 0.92 meters. That might not seem very high, however remember that is the change in place of his facility of mass and also not his feet. Throughout that time the rotates twice. So, I have the right to calculate his mean angular velocity through a rotation the 4π radians. This offers a rotation rate of 14.5 radians per 2nd or 138 rpm. Yes, that's fast. I don't recommend you shot this on your own.
Rhett Allain is an combine professor that physics in ~ Southeastern Louisiana University. The enjoys teaching and talking around physics. Occasionally he takes things apart and also can't put them ago together.
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