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Tool: Balance
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Go to: http://www.math.msu.edu/~nathsinc/java/Teeter/ (opens a new window)
Description: This applet allows students to play with the concept of force and mass, and provides them with a great introduction to algebra as they attempt to formulate rules for balancing a teeter-totter and for figuring out "Mystery masses". Guiding questions are provided on the applet page.
Technology Type: Java Applet 
Authors: Sarah Skinner
Mariska Kempe
Nathalie Sinclair
Language: English 
Cost: Does not require payment for use

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Courses: Math 4 Algebra
Math 5 Algebra and expressions
Math 6 Algebra and expressions
Math 7 Algebra and expressions

  Jeff L
Comment:There is no explanation about how changing the distance from the fulcrum affects the results. The procedure has too mny steps for each change.