Did you see litter on your way to school today ?


Wouldn’t it be great to organize a cleanup day? It’s a big job, so you’re gonna need some trash grabbers.

How can you find the best grabber for the job?

Build two Grabbers.


You’ll start by testing these 2 grabbers. You’ll also need a controller.

If you have time, you should build and test your own design.

Gather the “litter.”


You’ll need :

  • 1 LEGO brick
  • 1 empty plastic bottle
  • 1 ball of crumpled paper  
  • 1 stack of LEGO wheels
  • 1 apple (or any round fruit)

You can replace the apple by any object of the same size and weight.

Play this program to test the 2 Grabbers.

SPIKE Invention-Squad Super-Cleanup Step04-Program - en-us

Which do you think works best?

Test #1: Object Size


Try to use each Grabber to pick up the empty bottle, crumpled paper, and LEGO brick.

Give it a score:

  • 1 point if it grabs, lifts, and moves the object
  • 0 points if it grabs but drops the object
  • -1 point if it doesn’t grab or lift the object

Note your scores in a table.

Test #2 : Object Weight


Repeat the last test using the LEGO wheels, crumpled paper, and an apple 

Note your scores in another table.

So, what’s your conclusion?

  • Which Grabber is the best for small objects?
  • Which Grabber is the best for heavy objects?

Collect more objects from around your classroom and predict which Grabber will be best at grabbing and lifting each.

How did you do?


Record a video explaining what you’ve been working on.

Make sure to include your whole team, even the camera-shy ones!