|Aerodynamics can be defined as the way air moves around the things. The principles of aerodynamics explains how an aeroplane is able to fly in the atmosphere. There are four forces that acts on flight and they are: lift, weight, thrust and drag. The force of aerodynamics comes from gravity pulling the objects down.This force makes the objects or things move up and down. So aerodynamics plays an important role in aerospace engineering. Open access to the scientific literature means the removal of barriers (including price barriers) from accessing scholarly work. There are two parallel roads towards open access: Open Access articles and self-archiving. Open Access articles are immediately, freely available on their Web site, a model mostly funded by charges paid by the author (usually through a research grant). The alternative for a researcher is self-archiving (i.e., to publish in a traditional journal, where only subscribers have immediate access, but to make the article available on their personal and/or institutional Web sites (including so-called repositories or archives)), which is a practice allowed by many scholarly journals.
Open Access raises practical and policy questions for scholars, publishers, funders, and policymakers alike, including what the return on investment is when paying an article processing fee to publish in an Open Access articles, or whether investments into institutional repositories should be made and whether self-archiving should be made mandatory, as contemplated by some funders.