Instead of drawing countless grids for your class, save time with large pre-drawn coordinate planes. Low cost and portable, X-Y Axis Cling Grids can cling to chalkboards, whiteboards, walls and other surfaces. They measure 22" square.
This 8-minute YouTube video from Mathodman Productions is an easy-to-follow introduction to coordinate plane graphing. It could be used to guide the teacher's own lecture before the experiment or assigned to students as preparation for class. The video starts with basic vocabulary of coordinate graphing and provides examples for the four quadrants.
Print graph paper for free! This is one of my most-used freebie sites. PrintablePaper.net provides grid printables with one to 24 lines per inch. These will be handy not only for this lesson but throughout the school year.
Teaching the hand squeeze lesson is easy. This free online plan from Rice University's Cynthia Lanius explains how to run the hand squeeze experiment and collect data. Optional extension activities are included.