Physics by Holt- Chapter 1 notes

The scientific method- 

make observations & collect data that lead to question→ formulate & test hypothesis→ interpret results/ revise hypothesis→ state conclusion.

Physics uses models that describe part of reality

• System- typically single object & items that affect it are the focus
• Models- simplify complex situations
• Models can help build hypothesis - can help identify the relevant variables
• Help guide experiment design

Numbers as measurements 

• SI is the standard measurement system for science
• Both dimensions & units must agree

Accuracy & precision

• Careful measurements are important 
• Problems w/ accuracy are due to error
• Precisions describes the limitations of the measuring instrument
  • Lack of precision is due to limitations

Significant figures- a common convention used to indicate precision

• SF of measurement includes all digits that are actually measured, plus 1 estimated digit
• SFs require special rules- the # of SFs in result depends on the # of SFs in measurement

Mathematics & Physics

• Physics equations indicate relationships 

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