For my senior year, the school sprang for a FORTRAN compiler to run on the business office NCR computer. My job was to run the students punch-card decks through the computer during the business office lunch hour. Spent an interim month learning to use FORTRAN as a language usage analysis tool, under tutelage of a Classic Languages professor.
electric forces can be attractive or repulsive, whereas gravitational forces are only attractive.
There are four interactions known to science, they are called gravity, electromagnetism, weak and strong. These interactions often manifest themselves as forces between particles. The gravitational interaction, for example, is responsible for the attractive force between masses. The electromagnetic interaction is responsible for the attractive or repulsive forces between charges. Interactions are referred to as forces when an amount of strength can be quoted as a measure of the interaction. In fact force is just a special case of an interaction.