1. Where is the center of gravity?

• [field] moment of force
  
• [type] students
  
• [target] age 16
  
• [contents]
  1. Purpose

     Let's look for the center of gravity. Dose the result of the experiment give good agreement with theoretical calculation ?

  2. Preparation

     A sheet of paper, scissors, a ruler, a nail, a string, a weight

     

  3. Method
     1. Image a shape whose center of gravity you want to look for.
     2. Calculate where the center of gravity is.
     3. Cut a sheet of paper in the shape you imaged, and mark the point obtained from your theoretical calculation as the center of gravity.
     4. Tie a nail and a weight at each end of a string.
     5. Stick the nail anywhere you like in the paper.
     6. Hold the nail and hang the paper and the weight.
     7. Draw a line along the string. If your calculation is correct, the line gose through the point of the mark on its way to the bottom.
     8. For confirmation, do the same thing choosing a different point. Does the line also go through the point you have marked ?

  4. Culcuration

     == An example of the calculation ==

     

  5. �@Result

     == An example of student's paper ==

     

• Thanks to Yuichi Hirano, Tesima highschool, and Toyo Morisawa, Shitennoji highschool, OSAKA, JAPAN.

Home page	Dynamics	Thermo dinamics	Wave, Sounds, Light	Electro- magnetism	Atom physics