Back to School STEM Activity: Rubber Band Car Challenge (BTS19)

Bring elastic potential energy storage, rotational kinetic energy transfer, axle torque multiplication, wheel surface traction optimization, coasting friction reduction, and distance-per-wind efficiency calculations to life with the Back to School STEM Activity: Rubber Band Car Challenge (BTS19)! Designed for Middle School Physical Science, Physics, Automotive Engineering, Math, Homeroom, and STEM classes across Grades 6–8, this 2-page, print-ready lab packet challenges student teams to engineer wound-rubber-band powertrains capable of driving cardboard chassis vehicles maximum linear distances.

What Is Included in This 2-Page Packet?

• 🏎️ Page 1: Student Mission Card & Blueprint

  Hooks students with a real-world automotive powertrain and mechanical energy storage scenario. Includes strict material and design constraints (2 rubber bands, 2 wooden skewers, 4 bottle cap or CD wheels, 2 drinking straws, cardboard chassis base, 1 paperclip anchor, masking tape, distance goal baseline) alongside a dedicated Powertrain Drive & Axle Schematic workspace to diagram axle winding hooks, torque transfer loops, axle sleeve housings, and rubber tread traction surfaces.

• 📊 Page 2: Testing Log & Scientific Reflection

  Features a structured lab testing table tracking axle rotation wind counts (5 vs. 10 vs. 15 rotations), total linear distance traveled in centimeters (cm), and drive failure modes across 3 prototype trials. Includes an applied math section to compute Distance-per-Wind Efficiency Ratios (Efficiency = Distance Traveled / Number of Winds) in cm/wind, followed by physics reflection questions evaluating strain energy stored in stretched rubber, torque output versus wheel slippage, wheel tread traction control, and bearing friction minimization.

Educational Value & Key Benefits:

• Hands-On Mechanical Powertrain Physics: Demonstrates how unwinding rubber bands convert stored elastic energy into rotational torque turning wheel axles.

• Integrates Applied Math & Ratio Calculations: Teaches students how to combine distance metrics and mechanical wind inputs into quantitative work efficiency ratios (cm/wind).

• Low-Cost High-Engagement STEM: Uses accessible materials like cardboard, drinking straws, wooden skewers, rubber bands, and bottle caps for an active, highly competitive physical science lab across Grades 6–8.