2. * Cars * Bicycles * Tools * Toys * Wires

3. * Some metals are very hard and strong. * Metals conduct heat and electricity well.

4. * YES! * Iron * Steel * Aluminum * Other metals

5. * Air * Water * Wood * Plastic *

6. * A material that easily conducts heat energy. * Examples: * Gold * Copper * Silver

7. * The ability of a material to transfer heat energy.

8. * Materials that do not conduct heat well. * Examples: * Wood * Plastic * Glass

9. * Aluminum is a conductor. It transfers heat easily.

10. * Coolers are made of a material, such as plastic, that is an insulator. The material prevents heat from entering the cooler. Therefore, items in a cooler can remain cool.

11. * It prevents heat from flowing from the person’s body to the surrounding air.

12. * To keep warm * To keep objects cool * For cooking

13. * The handle should be made of an insulator. Insulators do not conduct heat well. A person using the frying pan can grab the handle and not get burned.

14. * Fur is insulating because it traps a layer of warm air against the body. When fur is wet, it can lose air that was trapped in it. As a result, wet fur is less effective as an insulator.

16. *I*I nsulators

17. * Electrical wires are usually made of copper or aluminum. Copper and aluminum are metals, which are good conductors of electricity. They transfer electricity from the outlet to the electronic device.

18. * Glass is an electrical insulator. It is a nonmetal. Most nonmetallic solids are not good conductors of electricity.

19. * Rubber is a type of insulator. Rubber gloves can help protect electricians from electric shock.