Unit 5 Materials - Note

• Objects can be classified according to the materials they are made of.
• Different materials have different properties.
• Non-metals are generally good insulators of heat and electricity.
• A good conductor of heat is also a good conductor of electricity.
• Materials can be classified based on their abilities to allow light to pass through.
• Materials can be transparent, translucent and opaque.
• Suitable materials can be used to keep hot things warm and cold things cool and chill.
• Materials chosen to make objects are based on their properties.
• Some materials can float and absorb water. Some can be stretched.
• Man-made materials come from natural materials.
• Natural materials are limited in supply.