Built around a single testable question, this lab asks whether spider silk is stronger than thread of the same diameter. Students collect silk from a large orb-weaver web, cut a 10 cm strand, suspend it between two supports, and add mass to a hanging cup in small increments until the strand snaps. The data table captures diameter in millimeters and breaking mass in grams across three trials for each material, with an average row to compare. An optional calculations section introduces the tensile strength formula F over A in N per mm squared, making this appropriate for grades 5-8 depending on how far into the math your student is ready to go.

The spider silk tensile strength lab fits naturally into a unit study on biomaterials, animal adaptations, or the physics of forces. It works as a standalone experiment or as part of a broader materials-science sequence, and the reflection prompt asks students to identify one improvement to their method, building scientific thinking alongside data collection. Completing all three trials for both materials and calculating averages demonstrates controlled experimental design, a skill that carries forward into more advanced lab work.