Table of Mechanics Demonstration

List of Mechanics Equipment & Supplies

Lecture Demonstrations

Tablecloth Pull, 1F20.30

Topic and Concept:

Location:

BeakerOnCloth02-400.jpg

Abstract:

AKA Beaker and Cloth. A beaker partially filled with water is placed on a seamless tablecloth favoring an edge. The tablecloth is quickly yanked out from under the beaker, leaving the beaker in place without spilling any water. Thus, illustrating Newton's first law.

Equipment

Location

ID Number

Tablecloth

ME, Bay A7, Shelf #5

Two-Liter Beaker

ME, Bay A7, Shelf #5

Important Setup Notes:

Setup and Procedure:

  1. Place the tablecloth on a table.
  2. Partially fill a beaker with water. Add food coloring to water for contrast.
  3. Place beaker on and near an edge of the tablecloth.

Cautions, Warnings, or Safety Concerns:

Discussion:

The quick jerking motion of the tablecloth has enough energy to overcome the normal force of the beaker and the frictional forces between the cloth, table, and beaker. First pull the tablecloth with the water filled beaker on it slowly, thus showing that the beaker moves with the cloth. Just before everyone thinks your going to make a mess. Give the cloth that quick jerk. The beaker will remain at rest and not move much. The water may slosh back and fourth a little.

BeakerCloth04-250.jpg

Beaker01-250.jpg

Cloth02-250.jpg

Videos:

References:

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