Mechanical toy - “Tumbling Bear”

This toy differs from factory mechanical toys in that it does not require a plant or a battery, since it moves according to the laws of physics - the conversion of potential energy into kinetic energy. The main part of the tumbling bear is an internal mechanism that provides movement - a hollow tube with a ball rolling inside. The tube can be made independently of cardboard of arbitrary size, and you can use the finished one - the inside of a roll of toilet paper. The ball can also be taken either ready, but in the absence of one, you can make it yourself.
 Mechanical toy -
A small piece of clay with metal objects that are not needed in the household is easy to turn in a heavy balloon,hiding details (nuts or bolts) in a plasticine shell.

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