Our first ever super simple homemade LEGO zip line was immediately a hit! Why not add to it! SO we came up with another great idea using an actually pulley mechanism. This cool LEGO Zip Line Challenge is a great STEM activity for kids of all ages to have fun with and learn something from. We love easy LEGO activities!

Build a LEGO zip line for kids STEM activities. LEGO and STEM go together. This STEM challenge uses a simple pulley to make a toy zip line. Explore physics with a homemade zip line and check out friction, energy, and motion. Science experiments and activities perfect for young kids including preschool, kindergarten, and early elementary age kids.

Make A LEGO Zip Line For Simple Physics

Just a few simple materials are all you need to get started. STEM activities can be simple to do and set up at home! You can really make this LEGO zip line activity as easy or as complicated as you like depending on what you want to build and where you want to test it.

In my experience, kids love building things that go! This is the PERFECT challenge for crafting and creating something that goes with problem solving opportunities along the way.  Also check out our self propelled car projects for kids.

Building this LEGO zip line is an awesome project for the kids that’s screen free. A great boredom buster for an inside day or a neat physics lesson for the classroom! Around here we look for cool hands-on ways to play and learn at the same time.

What Is STEM For Kids?

STEM sounds complicated, but it isn’t! Once you get how science, technology, engineering, and math (STEM) mingle, you can see how it applies to so many of the science and STEM activities you already love.

The best STEM activities encourage your kids to use at least 3 of the 4 pillars of the STEM acronym (science, technology, engineering, and math) to tackle their projects head-on, challenge what they know, and build character. The lessons STEM can teach our kids are priceless!

Have you played around with science with your kiddos? If you haven’t, you are in for a real treat. And if you have, you already know how much fun STEM activities are…

Unlock your kids’ curiosity, and spark their inner inventor! The world of science and STEM is AMAZING with these hands-on science experiments and STEM activities!

You don’t have to be a rocket scientist to share STEM with your kids. We have everything you need: simple-to-follow activities, low-prep ideas, easy-to-digest science information, and inexpensive supplies.

LEGO Zip Line STEM Challenge

Helpful STEM Resources To Get You Started

Here are a few resources to help you introduce STEM more effectively to your kiddos or students and feel confident when presenting materials. You’ll find helpful free printables throughout.

Get your free printable brick building challenges!

LEGO Zip Line Challenge

Check out this LEGO zip line, if you want to make something that is just with bricks!


  • Rope {clothesline}
  • Pulley Mechanism {also clothesline supply}
  • LEGO Bricks, Plates, Minifigures

Set Up:

Check out the photos below to see how we crafted this cool LEGO zip line. We built a floor, a roof, two side walls, and an attachment piece to add the pulley. However, this is a STEM challenge, so try designing your own too!

Building a LEGO Zip Line


We attached the rope to 2 fixed points in the house. You could also try it outside but keep track of the pieces if you have a crash landing! Test out different angles with the rope to explore force and motion.

Do different angles increase or decrease speed? Can you increase or decrease speed halfway through? Test out different designs to see which ones hold up better too!

YOU MIGHT ALSO LIKE: LEGO Math Challenge Cards

LEGO Zip Line Activity for Kids Science

More Fun LEGO Building Challenges

Make sure to also check out our free printable LEGO building challenges! There are tons of cool themes and topics to choose from!

Printable Brick Building Pack

Don’t want to bother checking out every link 👆, grab the huge brick bundle instead. Make it easy on yourself.

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  • 10O+ Brick theme learning activities in an e-book guide using the bricks you have on hand! Activities include literacy, math, science, art, STEM, and more!
  • A complete year of Brick themed seasonal and holiday challenges and task cards
  • 100+ page of The Unofficial Guide to Learning with LEGO ebook and materials
  • Brick Building Early learning pack filled with letters, numbers, and shapes!


  1. I’m an educator looking to utilize this idea in one of our summer camps this June. Wondering where you found such great pulleys? Our STEM teacher would love several for the lab and after some searching, Amazon seems very pricey. Would welcome any suggestions! Thanks so much and love this idea!

  2. We picked this stuff up cheaply at the hardware store like Lowes or Home Depot. It’s made for a laundry line!

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