So I tested the wooden sphere, and has proved that it does not make a good material for newtons cradle, so i tried one more thing, I stick a pieces of stainless steel into the centre of the ball, hopefully by making the centre pole of the sphere harden I can get the result i want, but it still doesn't work, and I have came out a theory why it doesn't.
So as you can see the stainless steel and wood are two very different material, it will waste a lot of energy on transferring between two materials, another reason, i think is that the energy is actually going through the entire sphere, so the wooden part of the ball is still absorbing energies. so...yea it just wont happen with wooden sphere.
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