Back to activities

Indoor activity

String Zipline Courier Mission

Build an indoor zipline and send tiny rescue parcels across the room using a straw carrier, then redesign the route for faster deliveries.

Ages 5-11 0-1 hours Education 8/10

Materials

  • Markers
  • Paper
  • Paper Clips
  • Scissors
  • Straws
  • String
  • Tape
  • Toy Dinosaur optional

Illustrated Steps

1

Build the Carrier

Cut a short straw section, then tape a folded paper pouch with a paper-clip hook underneath it.

2

Rig the Zipline

Tie string high-to-low between two points and slide the straw carrier on before final knotting.

3

Launch Missions

Load a message and release from the higher side, then tweak slope and tension for faster runs.

What You’ll Create

You will build a mini zipline delivery system that carries tiny messages and toy cargo from one “mountain base” to another. It feels like a secret rescue mission where engineering choices actually change performance! 🚚💨

How to Set It Up

Step 1: Build the Courier Carrier

⚠️ Adult Helper Needed — Use Scissors to trim a short piece of Straw (about finger length). Thread a Paper Clip through a folded strip of Paper to make a tiny cargo pouch, then tape that pouch under the straw with Tape.

Step 2: Rig the Zipline

Tie String tightly between two chairs, door handles, or heavy table legs so one side is slightly higher. Slide the straw carrier onto the string before tying the second end, then test that it can glide freely without snagging.

Step 3: Launch Missions

Write mini mission notes with Markers (“deliver medicine”, “save the dinosaur”) and place them in the pouch. Release from the high side and watch the courier zip down to the destination. Adjust height and tension to improve speed.

Have fun!

  • 🦕 Deliver a tiny Toy Dinosaur passenger and build a rescue storyline.
  • 🏁 Race two different carrier designs and compare travel times.
  • 📦 Add challenge rounds: fragile package, heavy package, or exact landing zone.
  • 🔁 Re-route the line through different rooms for a longer mission map.

Why It’s Amazing

  • Physics in Action: Kids experience gravity, friction, and slope by seeing speed change instantly. ⚙️
  • Design Iteration: Small tweaks (line angle, pouch size, weight) teach test-and-improve habits. 🔁
  • Problem Solving: When the carrier sticks, children diagnose and fix real constraints. 🧩
  • Communication Skills: Mission messages turn engineering play into collaborative storytelling. 💬

Pro Tips

For ages 3-5: Let them launch and receive while an adult builds the carrier and line setup.

For ages 5-8: Have them predict which change will make it faster before each test.

For ages 8-12: Track distance and time to calculate average speed, then optimise for efficiency.