3fde62fa_n_of_Inquiry__Labs_in_Volume_2__Counting_Clips
In this lab you keep a teeter totter balanced using two force sensors. How is the force from one related to the force from the other? How does that relationship depend on where you press? [Counting Clips] 
Dynamic Teeter Totter
A Den of Inquiry: Labs in Volume 2
Counting Clips