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The Science of Physics

The Science of Physics. Chapter #1 Ms. Hanan Anabusi. 1-2 Measurements in Experiments. Objectives List basic SI units and the quantities they describe. Convert measurements into scientific notation. Distinguish between accuracy and precision.

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The Science of Physics

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  1. The Science of Physics Chapter #1 Ms. HananAnabusi

  2. 1-2 Measurements in Experiments Objectives • List basic SI units and the quantities they describe. • Convert measurements into scientific notation. • Distinguish between accuracy and precision. • Use significant figures in measurements and calculations.

  3. Numbers as Measurements • Numerical measurements are required in Physics. • Numerical measurements are different from the numbers used in a mathematics class. • In science, numbers has dimension. • Dimension is the description of what kind of physical quantity is represented by a certain measurement . • The basic dimensions are length, mass, and time

  4. SI Standards • SI (System International) is the standard measurement system for science. • In 1960, an international committee agreed on the SI measurement system. • The base SI units of length, mass, and time are the meter (m), kilogram (kg), and second (s). • Units can be combined to form derived units (m/s, m/s2, etc..) • SI uses prefixes to accommodate extremes. See table 1.3 on page 12. • Build conversion factors to convert a measurementfrom its prefix form (32.7 mm to meters). • Both dimension and units must agree.

  5. Prefixes Ladder

  6. Sample Problem A typical bacterium has a mass of about 2.0 fg (femto gram). Express this measurement in terms of grams and kilograms.

  7. Solution Given: mass = 2.0 fg Unknown: mass = ? g mass = ? kg Build conversion factors from the relationships given in Table 1-3. Two possibilities are shown below. Only the first one will cancel the units of fg to give units of g. Then take this answer and use a similar process to cancel the units of g to give units of kg.

  8. Classroom Practice 1- The mass of an average woman is 60000000 mg. express this in grams and kilograms 2- The mass of a proton is . Express this in g, mg, and kg

  9. Practice A Page 15 Questions 1, 2, 3, 4, and 5 Even questions (2 and 4) as class-work, and odd questions (1, 3, and 5) as homework

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