spring launcher

[thegame]

i need to make a spring launcher that launches a small ball using a spring (one that stretches)... so how do i attach the spring to the piece of wood so when i stretch it all of the energy is converted to the ball..

[Adrian Baker]

Well for a start off your request is an impossibility - you can't transfer ALL of the energy to the ball, only a proportion dependant on the efficiency of the system.

Secondly you say "how do I attach the spring to the piece of wood " Well this does rather beg the question... What piece of wood?

[thegame]

well, i mean most of the energy should be transferred..

i going to use normal retangular wood..