What is the name for a representation of the physical world?

Why do your house light bulbs burn out fast? What material conducts electric current better than insulator but not as was as a conductor? How is physics related of other sciences? Example of a third order lever? What instrument measures electric potential? How is energy transferred through the water? Why can't a light microscope magnify any more than 2000 times? Is compression is a twisting force on objects? How much is 71.7 kilos? What speed does heat from the sun reach us transfer of heat take place? When you write on the board with a piece of chalk an irritating noise results when the chalk is held at some angles yet this does not happen at any other angles Why? You spot a friend on a bus while on your way to school. Why does your friend appear to be at rest even though the bus is moving? What is the different between series and parallel connection? An example of an Air Force multiagency coordination system element is a unit control center? What is the name of the lightproof box on which images are recorded on a material sensitive to light? What is translatry motion? What is the difference between Crushing strength and compressive strength? What is unequal forces acting in opposite directions? Infer why the output force exerted by a rake must be less than the input force? How do oil fueled power plants produce energy?

What is the name for a representation of the physical world?