SF.3.b Joints and fasteners

Friction results from...

• The weight of the force of gravity

• Particles of two surfaces shearing against each other

• An unknown source

• The magnetic force between objects

Which fasteners below are friction joints? (Select all that apply)

• Wooden dowels

• Screws

• Nails

• Interlocking joints

• Rivets

"Mass alone can be used to make a structural joint"

• True

• False

Which types of joints below are created by "bonding"? (Select all that apply)

• Gluing

• Welding

• Cement

• Taping

• Melting together

Which types of joints below are "movable joints"? (Select all that apply)

• Hinges

• Welds

• Flexible tubing

• Rivets

• Pin joints

Ligaments are animal structures that...

• attach bone to bone.

• attach muscle to bone.

• reduce friction.

• allow movement in 3 axis of motion.

Tendons are animal structures that...

• attach bone to bone.

• attach muscle to bone.

• reduce friction.

• allow movement in 3 axis of motion.

Cartilage is an animal structure that...

• attach bone to bone.

• attach muscle to bone.

• reduce friction.

• allow movement in 3 axis of motion.

Ball joints are animal structures that...

• attach bone to bone.

• attach muscle to bone.

• reduce friction.

• allow movement in 3 axis of motion.

Heartwood is tree structure that...

• is an outermost layer that protects the tree.

• is for support and doesn't conduct water or store food.

• contains both living and dead cells, and contains xylem and phloem.

• contains stomata that allow for gas exchange.