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Physics 218 Lecture 2. http://apod.nasa.gov/apod/ap070819.html. Overview of Calculus. Derivatives Indefinite integrals Definite integrals. Derivative is the rate at which something is changing. Velocity: rate at which position changes with time.
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Physics 218 Lecture 2 http://apod.nasa.gov/apod/ap070819.html
Overview of Calculus • Derivatives • Indefinite integrals • Definite integrals
Derivative is the rate at which something is changing Velocity: rate at which position changes with time Acceleration: rate at which velocity changes with time Force: rate at which potential energy changes with position
Derivatives or Function x(t) is a machine: you plug in the value of argument t and it spits out the value of function x(t). Derivative d/dt is another machine: you plug in the function x(t) and it spits out another function V(t) = dx/dt
Applications of derivatives • Maxima and minima • Differentials • area of a ring • volume of a spherical shell • Taylor’s series
Indefinite integral (anti-derivative) A function F is an “anti-derivative” or an indefinite integral of the function f if Also a machine: you plug in function f(x) and get function F(x)
Indefinite integral (anti-derivative)
Definite integral F is any indefinite integral of f(x) (antiderivative) The fundamental theorem of calculus (Leibniz) Indefinite integral is a function, definite integral is a number (unless integration limits are variables)
Example Given: Solve for x(t) using indefinite integral:
Given: Solve for x(t) using definite integral Using the fundamental theorem of calculus, On the other hand, since Therefore, or
Integration techniques Change of variable Integration by parts
Gottfried Leibniz 1646-1716 These are Leibniz’ notations: Integral sign as an elongated S from “Summa” and d as a differential (infinitely small increment).
“Moscow Papirus” (~ 1800 BC), 18 feet long Problem 14: Volume of the truncated pyramid. The first documented use of calculus?
Leonhard Euler 1707-1783 “Read Euler, read Euler, he is the master of us all” Pierre-Simon Laplace • f(x), complex numbers, trigonometric and exponential functions, logarithms, power series, calculus of variations, origin of analytic number theory, origin of topology, graph theory, analytical mechanics, … • 80 volumes of papers! • Integrated Leibniz’ and Newton’s calculus • Three of the top five “most beautiful formulas” are Euler’s “Most beautiful formula ever” “the beam equation”: a cornerstone of mechanical engineering