PHYSICAL PROPERTY: Stretchy
USE: strings
USE: Rocks
USE: Buildings
PHYSICAL PROPERTY: Stiff
FUNCTION: Flexibility
PHYSICAL PROPERTY: You can pull them
USE: Bridge/body Structure
USE: Handcuffs
USE: to group things
PHYSICAL PROPERTY: Not flexible
FUNCTION: Join
FUNCTION: Support
PHYSICAL PROPERTY: Rigid, hard
USE: Catapult or slingshot
USE: To join things
PHYSICAL PROPERTY: Elastic
