Force and motion
Force and Motion
Twister Comes Apart
If the Twister doesn’t stay together, the parallelogram bridge is probably not taped properly to the angle-folds. The first diagram below shows how the tape should be applied to the undersides of the two angle-folds, and then curled over the parallelogram, catching it securely. The following two diagrams show what can go wrong if there is too much or too little tape, or if the tape is not centered well.