This lab is one of my personal favorites because it includes a “challenge” for the students to correctly identify which colored spring has a specific spring constant. The students enjoy the challenge and it adds a bit of excitement to a lab activity. I ran across this spring set in a Pasco Scientific catalog, and I immediately thought that a lab like this would work great! I purchased three complete sets of these spring sets (giving me 15 total springs-each lab group would then have one to work on at a time and they could rotate amongst lab groups) and it works out BEAUTIFULLY. The students are really impressed when their graphs lead to the correct results! This lab certainly gets better results than the “Slinky Spring Lab” and has more math and graphing involved. However, if you want your students to do both labs-the extra learning that will invariably take place won’t hurt them!