By Mark Levi

This can be an intuitively influenced presentation of many subject matters in classical mechanics and similar components of keep watch over thought and calculus of adaptations. All subject matters through the booklet are taken care of with 0 tolerance for unrevealing definitions and for proofs which go away the reader at midnight. a few components of specific curiosity are: an incredibly brief derivation of the ellipticity of planetary orbits; an announcement and an evidence of the "tennis racket paradox"; a heuristic clarification (and a rigorous remedy) of the gyroscopic impact; a revealing equivalence among the dynamics of a particle and statics of a spring; a brief geometrical rationalization of Pontryagin's greatest precept, and extra. within the final bankruptcy, aimed toward extra complex readers, the Hamiltonian and the momentum are in comparison to forces in a definite static challenge. this offers a palpable actual desiring to a few possible summary recommendations and theorems. With minimum necessities together with easy calculus and simple undergraduate physics, this publication is acceptable for classes from an undergraduate to a starting graduate point, and for a combined viewers of arithmetic, physics and engineering scholars. a lot of the joy of the topic lies in fixing nearly two hundred difficulties during this booklet.

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**Extra resources for Classical Mechanics With Calculus of Variations and Optimal Control: An Intuitive Introduction**

**Example text**

The two problems are therefore equivalent: the particle moving in the potential U and the spring resting in equilibrium in the potential V = −U . The equivalence means that the same critical function x(t) describes the motion of a particle in the potential U and the static equilibrium of the spring in the potential −U . Example. Figure 27 illustrates the equivalence. Note how the stretching of the spring is related to the speed of the particle. Actually, both the spring and the particle are conﬁned to the x-axis rather than to the graphs of the potentials, as represented by the more accurate (but less intuitive) Figure 28.

41 Figure 24. 55). 57) 1 x(F ) = √ 2 2π F 0 √ T (E) dE F −E We found an explicit expression x(F ) = U −1 (F ) for the inverse function of U . This describes U (x) completely, and solves the problem. 58) u dE (F − E)(E − u) =π: a linear substitution reduces the integral to sin−1 (−1) = π. 4. A quadratic potential U = 12 x2 is isochronous in the sense that all the motions have the same period, namely 2π. 57) implies the converse: if a potential is isochronous of period 2π then it is of the form U = 12 x2 (assuming, as we did above, that U (0) = U (0) = 0 and that U is even and convex up).

1 on page 22). However, more is going on: the fact that actual motions are the “shortest” curves in space-time (t, x) reﬂects the fact that classical mechanics is the limiting case of quantum mechanics (see pages xviii and 286 for further discussion). 9. Euler–Lagrange equations — general theory 21 Remark. 22). This is explained in Chapter 6. Analogy between functionals and real functions of several variables. To get more intuition on functionals and their critical functions just deﬁned, note that our functional S[x] is an analog of a real function of many variables.