Physics 111, Fall 2005 Classical Mechanics

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Physics 111, Fall 2005 Classical Mechanics

• Prof. Haimin Wang
• haimin_at_flare.njit.edu
• http//solar.njit.edu/haimin

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My Research Solar Physics Instrumentation Magneti
c Fields and Solar Activity
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Week 1

• Chapter 1 Sections 17
• Measurement
• International System of Units (SI System)
• Conversion of Units
• Length
• Time
• Mass

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Measurements

• Use laws of physics to describe many different
  physical systems
• Small set of simple laws
• Common language is mathematics
• Test laws by experiments
• Select smallest set of standards and derive other
  standards
• International Bureau of Weights and Measures
  (Paris), National Bureau of Standards, etc.
• Système Internationale (SI), International System
  of Units, metric system, or mksA system

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SI Units
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Prefixes for SI Units
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Prefixes for SI Units
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Example of Length
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Time

• 1 second is the time taken by 9,192,631,770
  oscillations of the light emitted by cesium-133
  atom
• Speed of light c299,792,458 m/s

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Example of time
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Mass

• Standard 1 a platinum-iridium cylinder in Paris
• Standard 2 Carbon-12 has 12 atomic mass units
  (u). 1u1.6605402x10-27 kg

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Example of mass
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Units

• Language is mathematics
• Equations
• Diagrams/visualization
• Quantities have dimensions
• Results have units
• Consistency

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Precision

• Measurements
• Uncertainties
• Absolute
• Percent
• Calculation
• Result can not be better than data
• Use scientific notation to show significant
  figures
• Examples
• 3.14 0.5 3.6
• 123,400,000 1.234 x 108
• 0.003 3 x 10-3

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Sample Problem 1-4, p6
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Chapter 3 Vectors

• Vectors and Scalars
• Adding Vectors Geometrically
• Components of Vectors
• Unit Vectors
• Adding Vectors by Components
• Vectors and the Laws of Physics
• Multiplying Vectors
• Scalar Product
• Vector or Cross Product

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Vectors and Scalars
Displacement
Path independence
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Laws of Vector Addition
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Components of Vectors
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Unit Vectors and Coordinate Systems
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Vector Multiplication
Vector/cross product
Scalar product
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Sample Problem 3-4