Cylindrical stack of discs

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Back to 1F - Newton's First Law
PIRA index: 1F20.34

Description

A stack of cylindrical discs is placed on a table. Discs from the bottom are removed by hitting them with a ruler. The remaining discs drop down to the table each time without falling over.

Equipment

  • stack of discs
  • solid ruler
  • flat surface

Instructions

Set the stack of discs on a flat surface. Swiftly remove the bottom disc by hitting it with the side of the ruler. The stack should drop down without toppling over.

Keywords

disc, mass, ruler, tablecloth

Images & Movies

  • Figure1

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