Why don't my glass and stone balls work in a Newton cradle?

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Craig113
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have been trying to make me own workig Newton cradle. I know some physics. the problem is that my balls don´ta completely stop moving after the coalition, they rather continua their movement but with a reduced violocity. This typ of movement increases and grows with the number of coalitions. At the end all of the balls move with eatch other. And that's not what i want. The balls i have been using are glas or stone balls. I could not get my hands on metal balls. Can that be the reason for this failure?
 
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Friction at the point where you attached the ball's to the support and loss of energy in inelastic collisions. Metal balls are much more elastic than glass or stone.
 
Thanks for replaying. I don't think friction is the answer to why the movement of the balls are not the way they are supposed to be. Friction can only explain why do movement slows down and gradually ends. The collision is inelastic, that means that the kinestic energy turns into heat but how can this effect the type av movment?
 
Craig113 said:
The collision is inelastic, that means that the kinestic energy turns into heat but how can this effect the type av movment?

What if the first collision were totally inelastic? This would be the case if the balls were made of something that deformed without springing back, like clay. Don't you think that would "effect the type av movement"?
 
Still, it does not make sense. Stone balls should be elastic enought to get the desired type of movement. I mean, what type of balls did Netwons himself use? Did he not use stone balls? I think he did.