>>16691862Pretty much all of classical mechanics is based on calculus, it's not a coincidence that Newton contributed that much to both since one is just an application of the other.
"The area under the curve" is something abstract since "the curve" is just some graphical representation of a function. A typical example is the following: given a distance from a point in function of time, the first derivative will be the speed in function of time. On the other hand, if you give me a starting distance, and the speed in function of time, the integral will give you the traveled distance over a time interval dt. (example if I travel 50km every hour for four hours then I will have traveled 200km)
In other words the derivative of a function gives you the rate of change of a function at a specific point, and the integral gives you the amount of change over an interval.