Structural Joints

What are mobile joints?

• joints that do not allow movement

• Joints that allow movement

• Joints that are always rigid

• joints that are only found in machines

What can happen to human joints without lubrication?

• They become stronger

• They become more flexible

• They develop arthritis

• They stop moving

What can cause chair legs and table legs to become wobbly?

• Expansion of wooden parts

• Shrinking of wooden parts

• Lubrication of joints

• Tightening of screws

What is a common problem with using fasteners like nails and staples?

• They weaken the materials they fasten

• They are too strong

• They are difficult to find

• They are too expensive

What is the function of a ball and socket joint?

• To prevent movement

• To connect electrical circuits

• To support heavy weights

• To hold parts together while allowing movement

What is the role of tendons in a ball and socket joint?

• To connect muscles to bones

• To provide lubrication

• To store energy

• To produce synovial fluid

What can happen to clothing at seams if not properly fastened?

• It becomes stronger

• It becomes waterproof

• It comes apart

• It changes colour

What must be carefully planned when making a strong joint?

• The colour of the fasteners

• The kind and number of fasteners

• The size of the parts

• The shape of the material

What would be something good to tie with a lace?

• Presents

• Shoes

• Hair

• Wires

What was the eventual use for the temporary adhesive developed by Spence Silver?

• Sticky bookmarks

• Shoe glue

• Wallpaper paste

• Superglue