Favorite Exploratory Labs to Introduce Various Functions

I thought I would repost these lab activities.  They are all favorite activities!

Using lab explorations to introduce functions in Algebra provides engagement as well as data collection analysis activities.  Students use everyday materials to collect data.  The data describes specific functions.  Here are a collection of "lab" activities I've tried in the past few years:
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Linear (and Quadratic) Function: Pass the Ball

All the information needed for this activity is in this blog post.  Students pass a ball to one person, timing the event.  Then to two people, three people, etc.  This is a very easy lab to set up.
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Quadratic Function: Stacking Starbursts and Kangaroo Conundrum

Both of these activities are simple, table top activities that result in quadratic patterns.  I provide instructions in this blog post.
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Square Root Functions: Inclined Plane Data Collection

A copy of the instructions can be found here.  Students roll a marble on an inclined plane - varying the distance of the roll, and measuring the time it takes to reach 0.
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Exponential Functions: M 'n M Data Collection

This is popular for obvious reasons - students love to eat the m 'n ms after the experiment is complete.  We do both parts ... exponential growth and decay.  I wrote a short blog post - without any real helpful information here and also here.  The handouts with instructions can be found here and here.
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Rational Functions: Spaghetti Cantilevers

Instructions are online.  Students bundle 2, 3, 4, 5, 6 pieces of spaghetti and hang a weight from the end without breaking the spaghetti.  They collect the data and analyze it.  The rational function is the model for the cantilever.  I write a blog post about this lab here.