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This web page phys171.phy.ntnu.edu.tw had the following on the web page, "A pendulum consists of a strong thread and a bob." We viewed that the website said " When the pivot of the pendulum starts moving along a horizontal circumference, the bob starts tracing a circle which can have a smaller radius, under certain conditions." It also said " Investigate the motion and stable trajectories of the bob. Button magnets are attached to both ends of a small cylindrical battery. When placed in a copper coil such that the magnets contact the coil, this train starts to move." The header had 台灣青年學生物理辯論競賽 as the highest ranking search term. It is followed by typt which isn't as ranked as highly as 台灣青年學生物理辯論競賽.