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Physics Review Topics

Physics Review Topics. Things you should know from Chemistry…. SI Units (Metric System). Base Units: m,kg,L,mol,s Combination of Base Units=Derived Units(g/L) Table 2-1 pg. 17 lists metric prefixes Remember Metric System is based on Powers of Ten! Converting….

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Physics Review Topics

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  1. Physics Review Topics Things you should know from Chemistry…

  2. SI Units (Metric System) • Base Units: m,kg,L,mol,s • Combination of Base Units=Derived Units(g/L) • Table 2-1 pg. 17 lists metric prefixes • Remember Metric System is based on Powers of Ten! • Converting….

  3. Significant Digits/Figures • Rules: • Nonzero digits are always significant • Final zeros after a decimal are significant • Embedded zeros are significant • Placeholder zeros are NOT significant • Do not use constants or numbers that are not measurements (ex.1day) to decide on significant digits in a problem!

  4. How many “sig figs” in an answer? Adding & Subtracting Multiplying & Dividing Round to the same number of significant digits as the least precise value (one with the least digits) • Round to the PLACE of the least precise value (one with the least digits after decimal)

  5. Scientific Notation m x 10n • Where 1 < m < 10 and n is an integer • If you move the decimal to the left, n is positive and if you move the decimal to the right, n is negative • When converting to scientific notation, you take away non-significant zeros!

  6. Arithmetic with Scientific Notation • Adding and Subtracting: • Exponents must “match”…if they do not, move decimal until they do! • Multiplying and Dividing: • Exponents do not have to “match” • Multiplying: add exponents • Dividing: subtract exponents

  7. Graphing2.3 This is just a quick refresher…to be completely prepared, you should read this entire section and review the graphics

  8. Types of Graphs:

  9. Line Graph Reminders • Independent variable • X axis • Thing you are changing • Time is a common ind.variable • Dependent variable • Y axis • Thing that changes due to independent changing • Making Graph • Labels (title and axis) • Spacing of numbers • Types of Line Graphs • Linear, Quadratic, and Inverse

  10. Linear Relationships • Graph is a straight line • Relationship between variables can be shown in this equation: y=mx+b • m=slope (rise over run) and b=y-intercept • Slope can be positive or negative:

  11. Quadratic Relationship • Graph is a parabola, the parabolic relationship exists when one variable depends on the square of another. • y=kx2 • k is a constant that shows how fast y changes with x2

  12. Inverse Relationships • Graph is a hyperbola, a hyperbola results when one variable depends on the inverse of the other. • y=(k)(1/x) or xy=k • Where k is again a constant

  13. Interpolating/Extrapolating • Interpolating: Reading within a set of data points • Extrapolating: Extending past given data points to make a reading

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