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## Gravity powered devices => Gravity powered devices => Topic started by: iacob alex on January 10, 2020, 12:00:27 AM

Title: Kiiking toy...
Post by: iacob alex on January 10, 2020, 12:00:27 AM
.....if you take a look at : https://giphy.com/explore/kiiking
Now we can play an abstract mechanical equivalent model ( mass spring system on a pendulum ) , as :
https://youtu.be/z6_NRNw88Jw
.....but with the starting position on the top ( as an inverted pendulum ) , so to introduce an asymmetric
"assistance" of the rotational inertia (due to the spring in-out storage ).
This interplay of gravity with inertia has as a result a "self" continuous  accelerated rotation?
.....with an elementary test...we have an answer.
Al_ex

Title: Re: Kiiking toy...
Post by: iacob alex on January 10, 2020, 09:06:29 PM
.....if you take a look at : https://giphy.com/explore/kiiking (https://giphy.com/explore/kiiking)
Now we can play an abstract mechanical equivalent model (sliding- mass spring system on a pendulum ) , as :
https://youtu.be/z6_NRNw88Jw (https://youtu.be/z6_NRNw88Jw)
.....but with the starting position on the top ( as an inverted pendulum ) , so to introduce an asymmetric
"assistance" of the rotational inertia (due to the spring in-out storage ).
This interplay of gravity with inertia has as a result a "self" continuous  accelerated rotation?
.....with an elementary test...we have an answer.
Al_ex
Title: Re: Kiiking toy...
Post by: iacob alex on January 10, 2020, 09:26:36 PM
Hi
As a matter of fact we have an elastic pendulum(human performer ) attached to a common pendulum (seat and bars) playing not swinging,but a full 360* rotation.
Elastic pendulum at : https://en.m.wikipedia.org/wiki/File:2D_spring_Pendulum.gif
Al_ex
Title: Re: Kiiking toy...
Post by: iacob alex on February 17, 2020, 02:50:30 AM
.....starting with the elastic pendulum theory , at :
https://en.m.wikipedia.org/wiki/Elastic_pendulum (https://en.m.wikipedia.org/wiki/Elastic_pendulum)
As a simulation , step by step , at :
https://www.myphysicslab.com/pendulum/pendulum-en.html (https://www.myphysicslab.com/pendulum/pendulum-en.html)
(Swinging arms and seat/a rigid,non-elastic pendulum)
https://www.myphysicslab.com/springs/2d-spring-en.html
(Pumping person/spring mass)
https://youtu.be/z6_NRNw88Jw (https://youtu.be/z6_NRNw88Jw)
("Kiiking"/tumbling mass/spring mass system on a pendulum)
Now , we have a simple toy:we can play this one as a swinging one , or as a rotating one (if we start as an inverted pendulum...and search for a "skillful pumping"...or a "self" tumbling/rotating amusement "appearence"?!)
Al_ex