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Classical Physics. Introduction to Physics Textbook: Physics for Computer Science Students, by N. Garcia, A. Damask, and S. Schwarz, 2nd, 1998. Chapter One. Physical Quantities. Physical Quantities. In physics two fundamental processes are involved:

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classical physics

Classical Physics

Introduction to Physics

Textbook: Physics for Computer Science Students, by N. Garcia, A. Damask, and S. Schwarz, 2nd, 1998.

chapter one

Chapter One

Physical Quantities

physical quantities
Physical Quantities
  • In physics two fundamental processes are involved:

1. the description of natural phenomena based on experiments, which control variables;

2. mathematical manipulation or theorizing, which is a predictive process.

quantities and units
Quantities and Units
  • In classical physics the fundamental parameters in the measurement system are length, mass, and time.
  • There are two versions of the metric system in use, the cgs (centimeter, gram, second) and the mks (meter, kilogram, second).
  • Conversion of units
  • In square or cubic units, all measurements must be in the same units.
accuracy of numbers
Accuracy of Numbers
  • Suppose we wish to find the area of a rectangular surface.
  • See Figure 1-1.
  • Our measurement of widths is as

and The largest area is

and the smallest is

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We can write the answer as
  • The accuracy of the product cannot exceed the accuracy of any of the components in the product.
  • No matter how accurately a given parameter is measured, when is combined arithmetically with another measurement the result is only as accurate as the least-accurate measurement.
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