The laws of preservation in mechanics

Содержание и основные понятия

This chapter links observed phenomena, physical models, and mathematical laws, first form a qualitative picture, then explore the relationships in interactive models.
GEF · 10 grade
PIF · Baseline
theory + model
20
Chapter Pages
Three meaningful routes: concepts, laws, and model research.
20.1
System pulse
Force Pulse and Mass Center
20.2
Work and potential fields
Energy method
20.3
Movement of liquid and gas
Sequence of flow and Bernulli law
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Study route
20.1. System pulse
A change in the pulse of the system equals that of the external forces, the internal forces are decreasing in pairs, so the impulse is maintained for the closed system.
20.2 Work and potential fields
- The force work is equal to the integral rate of transmission of energy during displacement. For potential forces, work is independent of the path and equal to loss of potential energy.
20.3 Movement of liquid and gas
- For a steady flow of uncompressable fluid, the volume passing through different sections of the tube in a second is the same. Speed increases are accompanied by changes in pressure and altitude.
Basis of contents:
The federal work programme on physics, the GEF OSL/GS and the thematic sequence of popular school lines are written specifically for Alterna and does not reproduce textbooks.