Compared to the other two ball bounces I am much more interested by the way a shuttle cock falls. The way in which a shuttle cock bounces when it lands on the floor depends on the angle that the ball lands in comparison to the flexible structure - shown in the image above. The distance between the area in which the cork base hits the floor and the beginning of the flexible structure has a huge impact on how far and the direction of the bounce.
The way a shuttle cock bounces is more erratic then that of a bowling ball of tennis ball, and therefore you can get away with the direction of the bounce a little more then you would do with a bowling ball as its bounce is very rigid. Before i start to animate the bounce i want to look at different videos i can find online of a shuttle cock bouncing.
Initially i have come across how a shuttle cock would fly through the air. The ball always leads the way and lands first as it is the heaviest part of the object. If you hit a shuttle cock well you would hit the ball and therefore the ball has the most amount of force applied to it which means that it should be the fastest part of the object. Being made out of a cork structure this means that it has a lot of bounce.
The structure of cork : cork as a material has a lot of bounce, i have never looked into why is has such a bounce but i imagine that it has tiny particles or molecules of air - so small to the human eye that can cannot see them. These little molecules or particles give the cork movement, the pockets of air and squash when hitting an object and fill up again when no pressure is applied. This is why it is used as a lid for a bottle of wine etc. The air can be compressed out of the cork so that it is air tight. Much like when you go into sainsburys or any supermarket to buy some jam; the lids now have a extra tab on the top which when opened pops up, so as a customer you know when it has been opened. Corks are designed this way.
Structure of a cork:
I found this image online which is a microscopic image of a piece of cork. The demonstrates the tiny pocket of air that i assumed would be there to cause the elasticity of the object. You could see it as tiny little tennis balls all compounded into one object. However, due to the cramped nature of the air pockets they cannot repel against the floor as well as the tennis ball as the force of the bounce would travel through out the whole cork structure which would loose a lot of thrust energy. Where as with a tennis ball it only has to travel through itself - which is a empty shell.
To test this, i got ten tennis balls, placed them in a bag and tied it up tightly to allow minimal movement. I wanted to see how differently a tennis ball would bounce with other balls close. - They bounced well the the direction of the bounce was rather off. Obviously this was only a small test, this is not a scientific test but it was interesting to see how it would work.
In Soft Image:
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