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Summary
| Description |
English:
Bowling ball spin-up (with horizontal speed-reduction) between black dots i.e. a delivery that starts the ball in a skid which evolves into a roll. After spin-up the speed levels out as static-friction takes over, which in turn may allow side-roll to hook the ball into the pins. This provides a practical and visceral example of (i) angular-acceleration accompanied by translational-deceleration, (ii) kinetic versus static friction, as well as (iii) the rolling-constraint. The frame-residuals also make screen-captures useful for practicing Bayesian inference of a ball's properties from observational data.
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| Date | |
| Source | Own work |
| Author | P. Fraundorf |
Sample puzzler
False-vacuum adventure: As a hot-shot investigator for the United Nations Space Command , you are given the job of checking if a false-vacuum [1] [2] [3] has been smuggled into the solar-system in a shipment of bowling balls. All balls weigh the same amount but by video-taping each ball in use at the local bowling alley, can you determine which (if any) of the balls is hollow without perturbing the false vacuum or letting it out?
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Footnotes
- ↑ According to Alan Guth and other proponents of cosmic-inflation, false vacuums are capable of radically reconfiguring whole universes in the blink of an eye.
- ↑ A. H. Guth (1981) "The inflationary universe: A possible solution to the horizon and flatness problems", Phys. Rev. D 23 , 347.
- ↑ Ta-Pei Cheng (2005/2010) Relativity, gravitation and cosmology: A basic introduction (Oxford U. Press, Oxford/NY) link .