Why do some collisions bounce off each other and some collisions act like magnets and you stick?

Why do some collisions bounce off each other and some collisions act like magnets and you stick to the object? Video here:

This is in both DOTS and normal physics, and I always wondered why. It would help me to change the physics shape/body to use. Cuz I don’t want to stick like a magnet.

In the PhysicsShapeAuthoring there is a field called “Restitution”. Setting it to 0 will cause the object to stick and setting it to 1 will make the object bounce with complete elasticity. The dropdown next to the field determines how two objects will interact in a collision if their restitution values are different (geometric mean, minimum, maximum, arithmetic mean).

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