Explaining composites

Explaining composites

Workbook

• Pg 38

Multiple Choice

Polymers are made up of

• onemers

• monomers

• polymer

• molecules

Multiple Choice

A polymer made in the laboratory (or industry) usually made from petrochemicals

• nature polymer

• natural polymer

• protein

• synthetic polymer

Multiple Choice

Starch is composed of what monomers?

• sucrose
• glucose
• nucleic acids
• glycogen

Multiple Choice

Proteins are composed of what smaller subunits?

• amino acids
• nucleic acids
• fatty acids
• nucleotides

Composites

• formed when two or more materials often with different pproperties are combined.

• not chemically combined

Egyptians

mud+ straw - stronger & more durable

Archery bows

Concrete

Cement (limestone + clay = heated to over 700 degree C )

+

Sand

+

water

+ gravel

Composites are made of

matrix /binder

and

reinforcement (usually fibres, crystals or fragments)

Multiple Choice

Composites always have at least a ______ and a _______

• structure and tensile strength

• matrix and structure

• tensile strength and reinforcement

• matrix and reinforcement

Multiple Choice

what is reinforcement

• fibers or particles that give the composites strength,stiffness and density

• a composite with different sets of properties than its constituent materials

• decrease in cracking by distributing stress evenly

• fillers added to save money or modify properties

Multiple Choice

What is the binder and reinforcement found in bones.

• binder= collagen; reinforcement= calcium phosphate

• binder= calcium phosphate; reinforcement= collagen

Multiple Choice

What is the binder and reinforcement found in bones.

• binder= collagen; reinforcement= calcium phosphate

• binder= calcium phosphate; reinforcement= collagen

Multiple Choice

What is the definition of a composite?

• Composites are when you weld two or more metals together to form a new type of metal.

• Composites are a combination of two or more materials that are bonded together to improve their mechanical or physical properties.

• Composites are when you take 2 or more metals and fuse them through melting.

• Composites are when you take 2 or more matrix and mix them to create a new material.