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Removing Coins from a Dice Tower: No Magic — Just Physics
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/content/aapt/journal/tpt/51/4/10.1119/1.4795359
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Figures

Image of Fig. 1.

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Fig. 1.

Experimental setup.

Image of Fig. 2.

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Fig. 2.

Three different kinds (of many) of ballpoint pens suitable for the experiment. They need a spring to move the refill.

Image of Fig. 3.

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Fig. 3.

Demonstration of inertia as well as the physics of a horizontal throw: a coin ejected from a tower of dice by using a ballpoint pen. Recorded with NAC Hotshot 512 camera 1 at 3000 fps, integration time 1/20000 s, and 512 × 512 pixels. A video of the demonstration can be viewed at TPT Online. [URL: http://dx.doi.org/10.1119/1.4795359.1]doi: 10.1119/1.4795359.1.

Image of Fig. 4.

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Fig. 4.

Exactly the same experiment as in Fig. 3 recorded simultaneously with a Casio Exilim FH 100 camera operated at 420 Hz and 1/2000 s integration time, with 224 × 168 pixels. A video of the demonstration can be viewed at TPT Online. [URL: http://dx.doi.org/10.1119/1.4795359.2]doi: 10.1119/1.4795359.2.

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/content/aapt/journal/tpt/51/4/10.1119/1.4795359
2013-03-11
2014-04-21

Abstract

There are phenomena that seem impossible—at first glance. But some knowledge of physics can often allow us to plan and also perform the seemingly impossible without any magic. Here is a very simple experiment that can be done with a whole group of students. I learned about it from an activity in a science center, where it was posed as a magical puzzle.

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Scitation: Removing Coins from a Dice Tower: No Magic — Just Physics
http://aip.metastore.ingenta.com/content/aapt/journal/tpt/51/4/10.1119/1.4795359
10.1119/1.4795359
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