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Physics Chapter 1

Physics Chapter 1. Saul Beltran Mr. Kim 12/9/05 Per. 7. A Summary.

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Physics Chapter 1

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  1. PhysicsChapter 1 Saul Beltran Mr. Kim 12/9/05 Per. 7

  2. A Summary Physics, like other sciences, is a creative endeavor. It is not simply a collection of facts. Important theories are created with the idea of explaining observations. To be accepted, theories are tested by comparing their predictions with the results of actual experiments.

  3. Models and Theories • Scientists often devise models of physical phenomena. • A model is a kind of picture or analogy that seems to explain the phenomena. • A theory is usually deeper and more complex that a simple model. • A scientific law is a concise statement, often expressed in the form of an equation, which quantitatively describes a particular range of phenomena over a wide range of cases.

  4. Measurements and Units • Measurements play a crucial role in physics, but can never be perfectly precise. It is important to specify the uncertainty of a measure either by stating it directly using the ± notation, and/or by keeping only the correct number of significant figures. • The number of reliably known digits in a number is called the number of significant figures. (Example: 202 has three significant figures, but 200 only has one significant figures. Reason: when the zero is in between two numbers it is important, otherwise it is not. )

  5. Measures and Unites Continued • Physical quantities are always specified relative to a particular standard or unit. • The unit used should always be stated. • The commonly accepted set of units today is the System International (SI), in which the standard units of length, mass, and time are meter, kilogram, and second • When converting units, check all conversion factors for correct cancellation of units. • Making rough, order-of-magnitude estimates is a very useful technique in science as well as in everyday life.

  6. Important Information

  7. Some Typical Time Intervals and Masses

  8. Metric (SI) Prefixes

  9. The End? Thank you for listing to this presentation. If you are still reading this, then you have too much time because you are interested in physics. Now get ready for the test suckers.

  10. Quiz http://www.homework55.com/physics/ph8-16-05/Significant%20Figures.htm

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