Two teams, each with:

• CC SmartWheel probe

• CC Force probe

• handheld computer

• CC LabBook software

• 2 - long rubber bands (so they have a length of about 30cm when cut)

• constructed air carts (see Investigation: Air Cart)

• hot-melt (or cold-melt) glue gun and glue sticks

• paper clip

• pencil or pen