Conservation of mechanical energy is assumed if kinetic energy
(t) a potential energy (V) change back and forth in a conservative
system (the dissipation of energy is considered negligible). Equation
1.3.22 formalizes such a situation, where position 1 is the initial state
and position 2 is the ?nal state. The reference (datum) should be chosen to
reduce the number of terms in the equation.

t₁ + V₁ = T₂ + V₂

Linear and Angular Momentum Methods

The concept of linear momentum is useful in engineering when the
zrychlení of particles are not known but the velocities are.
The linear momentum is derived from Newtons second law,

G  = mv

The time rate of change of linear momentum is equal to síla.
When mv is constant, the conservation of momentum equation results,

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The Práce a energie equation for a system of particles is similar to the
equation stated for a single particle.

Momentum Methods for a System of Particles

Moments of Forces on a System of Particles. The moments z
external síly on a system of particles about a point O are given by

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Obecná rovina pohyb tělesa je de?Ned od simultánní
překlad a rotace v rovině. OBR 1.3.11 ilustruje, jak rychlost
k bodu lze určit pomocí rovnice 1.3.46, který je založen na
relativní pohyb částic.

OBR 1.3.11 Analýza rychlosti v obecné rovině pohybu.
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