Final Engineering Challenge

60-75 minutes

• Set up one shared 'hazard zone' - a taped gap on the floor or between two tables - about 40-60 cm across.
• Lay out the full materials table and have teams choose a solution path before they start building.
• Plan for three timed test runs with redesign time between them.

• Give every team the same kind of 'package' object (a small box, eraser, or toy) so results are comparable.
• Keep string, tape, and paper clips well stocked - zipline and crane builds use them up fastest.

• Ziplines need an anchor - use taped-down string or a chair, never anything at head height that could snap back.
• Keep feet clear of the hazard zone and run one team's test at a time.

• Combine structures, motion, materials, and testing into one working system.
• Use the full design process, including at least one redesign after a failed run.
• Explain the constraints and tradeoffs that shaped their design.

• Building too big to finish and test in time - push for a simple, testable first version.
• The package arrives but is damaged, because protection was an afterthought.
• A moving part (zipline or crane) with no tension control, so the package sticks or drops.

• "Which earlier lesson does this build use the most?"
• "What failed on your first run, and what one thing will you change?"
• "Where is the package most likely to get damaged?"
• "What tradeoff did you make - speed, strength, or weight?"

Narrow the hazard zone and steer teams toward the protective-package or bridge paths, which need the fewest moving parts.

Require two packages, a longer hazard zone, or a gentle landing with no dropping the package at the end.

• Untape the hazard zone and recover string, paper clips, and package objects.
• Keep the best builds for a showcase and recycle the rest.