- #1
leviterande
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How does the "enclosed" insect-cocoon jump 400 times its own length!?
Hi!
NOTE! this is not about the "mexican jumping beans" which barely move or roll, they never jump but only move a little bit and tumble.
There are several insect species that have remarkable jumping cocoons. Its the larva inside that is responsible for the extreme jumping action obviously. The thing is, that these small 1mm, 3mm and 6mm cocoons jump 20times, 116 times and even 400 times their own length!
Now How in this world do the cocoon jump this much??
Shouldnt it be impossible to move according to the physics law since there is always "action equals an opposite and equal reaction". The cocoon is "enclosed" and yet it jumps 100 times its own size!
It is possible of course to jump an enclosed ball,we are talking about ONLY small jumps, rolling, and maybe a maximum jump height of the ball/cocoon size.
Entomoogists say that it is the "abrupt action of the larva inside" that is responsible! But Seriously, however strong the larva may be.. it shouldn't jump several times its own length(ha?). The reason is simply that once the larva´s "head" hits the upper wall of cocoon (and cocoon starts to jump), the lower part of the cocoon will also jump of course and hit the lower part of the larva which should halt any big jumps...
I am really interested in how physically/ mechanically the cocoon jump 100 times its own length simply by jerking itself inside..
Your answers/discussion is highly appreciated
Regards
leviterande
Hi!
NOTE! this is not about the "mexican jumping beans" which barely move or roll, they never jump but only move a little bit and tumble.
There are several insect species that have remarkable jumping cocoons. Its the larva inside that is responsible for the extreme jumping action obviously. The thing is, that these small 1mm, 3mm and 6mm cocoons jump 20times, 116 times and even 400 times their own length!
Now How in this world do the cocoon jump this much??
Shouldnt it be impossible to move according to the physics law since there is always "action equals an opposite and equal reaction". The cocoon is "enclosed" and yet it jumps 100 times its own size!
It is possible of course to jump an enclosed ball,we are talking about ONLY small jumps, rolling, and maybe a maximum jump height of the ball/cocoon size.
Entomoogists say that it is the "abrupt action of the larva inside" that is responsible! But Seriously, however strong the larva may be.. it shouldn't jump several times its own length(ha?). The reason is simply that once the larva´s "head" hits the upper wall of cocoon (and cocoon starts to jump), the lower part of the cocoon will also jump of course and hit the lower part of the larva which should halt any big jumps...
I am really interested in how physically/ mechanically the cocoon jump 100 times its own length simply by jerking itself inside..
Your answers/discussion is highly appreciated
Regards
leviterande