Abstract
The problem addressed in this paper originates from IYPT 2019 Question 6: By starting with hand rotation and using a tube to blow up towards it, two steel balls connected together can be rotated at a very high frequency and explain to explore this phenomenon. It is found in the pre-experiment that even without the use of the tube blowing, the two-steel-ball system can maintain a fairly long rotation, the kinetic energy decreases slowly, which leads to the steel ball system and the table between the pure roll without friction. The equation of motion of the steel ball system is then derived from the pure roll condition analytically, and the equation illustrates that the angle 9 of buckling of the steel ball system is related to the angular velocity of rotation co and the radius of the ball r. The experimental results are verified with good agreement with the expected results.
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