and center of gravity
This is a home work problem shown in many Fundamental Physics
How to stack four uniform blocks on top of a table,
so that they extend as far right as possible and still remain stable.
How should each be positioned?
Can the top block have its entire length beyond the edge of the table.
Would you like to play!
So long as the center of gravity is directly above some point
within area of support, the system will be stable
You can drag and move blocks horizontal with your mouse.
The stability of the sub-system is color coded
sub-system is in stable equilibrium
yellow: the center of gravity is right above
the edge of the supporting block.
red: the sub-system is unstable, it will fall in real life.
The center of gravity for each block is shown as a small blue dot.
If you press "Show c.g." button
The center of gravity for the blocks being moved will be shown as a small
The length of the arrow is proportional to the gravitational force for
each balanced sub-system.
Label of this button change to "Hide c.g", and you know what it means.
Current mouse position is shown in the "Text Field" (relative to top left
edge of the table)
The percentage to the max. distance is shown on right edge of top block.
It will smile when you get 100%
All the other numbers are coordinates measured from the left edge of the
current window and they are all color coded.
|The left edge of each block under the number
|The center of gravity of each block the number
|The center of gravity for all the blocks above
How to make it better? Do I need to make blocks falling down if it is
Will it help the students learn more about the concept of center
of gravity ?
I need your suggestions. Please click firstname.lastname@example.org
Thanks to : Peter
O.B. Mikes, Paul M. Eugenio,
Jolanta Rosick-Blonska, ...
who were kind enough to contribute their valuable suggestions.
My personal Home Page: http://www.phy.ntnu.edu.tw/~hwang/
Last modified :