Second Step

Detailed Design and Prototyping

• Initial knowledge: (Day 5)

  • Introduction to basic principles of structural design and material selection. (ex; structural skeleton)

  • Guide students on creating detailed sketches or using CAD software.

  • Discuss the importance of minimizing friction in the design (e.g., bearing surfaces, wheel alignment).

  • Discuss about the potential energy stored in the mousetrap and the theoretical work it can do at different distances.

• Activities: (Day 6-9)

  • Detailed Design: Students select their best concept and create detailed design plans, including dimensions, materials specifications, and assembly instructions.

  • Material Selection: Students justify their choice of materials based on factors like weight, strength, and friction.

  • Prototyping: Students build a prototype of their mousetrap car. This may involve cutting, shaping, and assembling various materials.

  • Mechanical Advantage Analysis: Students perform initial calculations related to the lever arm length and its effect on the force and distance applied to the string. They also consider the impact of wheel diameter on the car's motion.

• Resources:

  • Various building materials (wood, cardboard, plastic, CDs/DVDs, etc.).

  • Tools for cutting, laser cutter, 3D printers and joining materials.

  • Measuring tools (rulers, tape measures, calipers).

• Feedback:

  • Review of detailed design plans, providing feedback on structural integrity, feasibility, and the incorporation of mechanical advantage principles.

  • Mid-prototype check-ins to identify construction challenges and potential design flaws.