## 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)

## Play this program to test the 2 Grabbers.

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!