How do magnetic forces repel or attract?

opposites attract. to explain why magnets repel each other, a north end of a magnetic will be attracted to the south of another magnetic. the north and north ends of two magnets as well as the south and south ends of two magnets will repel one another. when two magnets are brought near each other, like poles repel; opposite poles attract. when a magnet is brought near a piece of iron, the iron also gets attracted to the magnet, and it acquires the same ability to attract other pieces of iron.

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.