Final answer:
Heat-conducting objects are known as thermal conductors, with copper and aluminum being common examples. Objects poor at conducting heat, like wood, plastic, and rubber, are called insulators.
Step-by-step explanation:
Objects that conduct heat well are called thermal conductors, while objects that do not conduct heat well are called insulators. Some examples of good thermal conductors are metals such as copper and aluminum, which are also good electrical conductors. This is because they contain a large number of free electrons that can carry electrical current and can transport thermal energy efficiently. On the other hand, good insulators like wood, plastic, and rubber are poor heat conductors and are commonly used to reduce heat flow mainly because they do not have those free electrons that facilitate the transfer of heat.