(a) Different tippe top regimes in function of the position of the midpoint of the setscrew. The black lines are , the blue curve is , and the red curve is . The physical parameters for the construction are radius of the spherical shell in ABS of mm, thickness of the shell of mm, radius of the iron cylindrical rod of mm, radius of the (iron) weight of 10 mm, and height of the weight of mm. (b) Different tippe top regimes in function of the position of the midpoint of the setscrew. The black lines are , the blue curve is , and the red curve is . The physical parameters for the construction are radius of the ABS spherical shell of mm, thickness of the shell of mm, radius of the nylon cylindrical rod of mm, radius of the (iron) weight of mm, and height of the weight of mm.

(a)

(b)

Article of the Year Award: Outstanding research contributions of 2020, as selected by our Chief Editors. Read the winning articles.