Thanks for the suggestions. Making the string is the problem. I can make a cylinder. It can have collision detection, but it looks like a lead pipe falling to the floor. I can put bones in the cylinder and it then looks like a lead pipe with crinks in it that I have to physically bend at each joint. That looks dorky and requires key frames which are deleted if I add a (gravity) force to make it fall to the floor. The problems seem to be + Making something flexible that behaves like string falling. + A string made of zillions of little spheres would require individual keyframing and endless adjustments to the individual rotation of all those little spheres by hand. Even then it is problematic to make this look like a string affected by gravity and air. - I could make it wave, but the wave force would have no relationship to the falling motion. it's a real puzzler

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