# Kick of a robot

1. Jun 25, 2008

hello ,
first of all , let me describe my problem...
i want to design a robot that will kick a foot-ball .
the "leg" is a rod (that looks like a hammer) and it has a torque spring.
my question is - what are the equations and assumprions that need to be taken in order to calculate what kind of spring i need .
i think there's angular momentum preservation , energy preservation but i'm not sure if there's something else ..

thanks ,