Abstract:In a recent paper (2022 Eur. J. Phys. 43 035 004) Lineros considers a block (not necessarily initially at rest) which slides down from the top of a frictionless horizontal movable semi-sphere. The author studies the angle at which the block loses contact with the sphere and derives a cubic equation which determines that angle. In this comment, a considerably more elementary derivation of that result is presented.
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