*Shape of y versus x graph
Let a physical quantity y depends on other physical quantity x, this dependence is called a mathematical function & usually expressed as
y = f (x) (read as y is a function of x).
The dependence of y on x can be visualised by drawing a graph of function y = f (x). While plotting graphs the independent varaible is taken on horizontal line & dependent on vertical line. Shape of y versus x graph depends on the type of function.
Following types of y versus x graphs are frequently encountered in Physics.