Each group needs:

• set of two (or more) springs of differing stiffness (for example, five color-coded springs 30 cm in length in a storage box, at http://www.pasco.com/prodCatalog/ME/ME-8970_equal-length-spring-set/, for $39)
• ruler (such as 12-inch wooden or plastic ruler with English or metric scales marked, for ~$1)
• spring scale with 10 N capacity (for example, a tubular spring scale measuring grams and Newtons, at http://www.amazon.com/Tubular-Spring-Scales-Grams-Newtons/dp/B004MI9UOS/ref=pd_sbs_indust_3, for $5)
• ring stand (for example, a stamped steel support ring stand with a 4 x 6-in base and 5/16 x 18-in rod, at http://www.artistsupplysource.com/product.php?productid=64115, for $7)
• 3-inch ring stand attachment from which to hang springs (for example, http://www.hometrainingtools.com/ring-support-3-diameter/p/CE-RING3/, for ~$5)
• lab notebooks or paper, and pencils
• Hooke's Law Data Analysis Worksheet, one per student
• access to a computer with Microsoft Excel or a similar spreadsheet/graphing application

To share with the entire class:

• computer and projector to show four-slide Hooke's Law Presentation PowerPoint file