Choosing the right motor/electronic device for project

I would like to create small object to move a plastic glass imitating someone holding glass and shake it rapidly. (as if beggar hold a glass with coins and shake his hand)

What will be the best motor for doing so?

Maybe a servo motor.

Maybe a DC motor with gearbox and an eccentric mechanism of some kind.

Interesting project but you need to know the mechanical information before you can decide on a motor. How much force will it take to move it. What resources are available such as voltage, current, source of power, etc.

I have no answer for it for the moment. I guess I will need to build something that will hold a glass before try to move it

That is a great idea. After that we can start sizing the control and action portion.

(small) paint shaker as used in paint supply shops.

https://www.youtube.com/watch?v=YGcfqvIt6iw

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