This section is of great importance. Trying to understand the concepts of physics is one of the most difficult and essential procedures any student must focus on. This first lecture will offer you a critical overview of the correct use of formulas. I remember an old teacher of mine in the University of offense. One day during a live lecture, he taught us something I will never forget. formulas are the students opo, great phrase.
A long time after this, I started to realize it's deeper meaning only if you teach and get your students react reactions and bad habits. Then it is overused but the majority believes that knowing formulas means that they know physics too. Let's try to show what formulas really are. correct use of formulas means first Understanding what each symbol stands for. Second, checking the units of each physical quantity. Third, finding relationships between these quantities, and for correct use of vectors and scalars.
Now, let's study an example I would say classical one second Newton's law, net force equals mass times acceleration. Here we have sigma equals net force acting on an object, m equals mass of the objects, and a equals acceleration of the objects. Their units now, kilograms, meters per square seconds in Utah, where Newton is defined as the force which would make an object of one kilogram mass move at a constant acceleration of one meter squared second, relationships are rather complicated. Here, usually we write this law as sigma F equals m times a bat, it would be more useful to solve it for a first equals sigma over m. In this way, we have to understand that acceleration is directly proportional to net force, saying the opposite does make sense, because the effect is proportional to its goals and not the opposite. In this case, we have two vectors, a and Tiff and one scalar quantity, the mass.
They're connected with a formula having the general look of x equals c times y. This formula describes two collinear vectors of the same direction, since constancy is the mass which is always positive, of course, all these info enclosed in such a simple formula goal is to unfold and highlight well thank you