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Physics Topic 1
Measurements and Mathematics
• Physics• Measurements and Mathematics• Obj: SWBAT perform unit conversions and
assign the number of significant digits to ameasurement
• Do Now: What are some concerns you havefor physics?
• HW: Sign and return syllabus, sign up forRemind
• Physics• Measurements and Mathematics• Obj: SWBAT perform unit conversions and
assign the number of significant digits to ameasurement
• Do Now: How many cm are in 3.4 m?• HW: Sign and return syllabus, sign up for
Remind
SI UnitsCO
PY T
HESE
SI Prefixes
Conversions• 1 Tera gram = 1,000,000,000,000 grams• 1 Giga gram = 1,000,000,000 grams• 1 Mega gram = 1,000,000 grams• 1 kilogram = 1,000 grams• 1 gram = 100 centi grams• 1 gram = 1,000 milli grams• 1 gram = 1,000,000 micro grams• 1 gram = 1,000,000,000 nano grams• 1 gram = 1,000,000,000,000 pico grams
Dimensional Analysis (a fancy namefor changing units)
Tools for Measurement• Time
• Angle• Force
• Mass• Length
Making Measurements
• Read what the instrument says ANDONE MORE UNIT!!!
Trigonometry
• Sin A• Sin C• Cos A• Cos C• Tan A• Tan C
• 20/29• 21/29• 21/29• 20/29• 20/21• 21/20
• Sin A• Sin C• Cos A• Cos C• Tan A• Tan C
• 40/50• 30/50• 30/50• 40/50• 40/30• 30/40
• Sin A• Sin C• Cos A• Cos C• Tan A• Tan C
• 36/39• 15/39• 15/39• 36/39• 36/15• 15/36
• Sin A• Sin C• Cos A• Cos C• Tan A• Tan C
• 8/17• 15/17• 15/17• 8/17• 8/15• 15/8
Uncertainty in Measurement
• Precise – when data points are close to eachother
• Accuracy – when data points are close to thecorrect value
• Physics• Measurements and Mathematics• Obj: SWBAT perform unit conversions and
assign the number of significant digits to ameasurement
• Do Now: How many SigFigs are in 3.400 m?• HW: Sign and return syllabus, sign up for
Remind
Significant Figures / Digits (Sig Figs)• Rules for counting
1. All non-zero numbers count2. Zeros before a non-zero digit don’t count3. Zeros in-between non-zero digits count4. Zeros after non-zero digit only count if there’s a
decimal point
How many significant figures arerepresented in each of the following
numbers?
Adding and Subtracting
• Answer has the fewest number of
decimal places
Multiplication and Division
• Answer has the fewest number ofSignificant Digits
Scientific Notation
• Only count the coefficient for Significant Digits
Math with Scientific Notation• Add/Subtract power of 10 must be the
same
• Multiplication/Division
Rewrite the following numbers inscientific notation
• 4020• 13796• 0.015• 0.0000007• 1.80• 1 trillion• 430,000,000,000,000,000
Graphs• Independent variable – what the
experimenter changes (x-axis)• Dependent variable – what the experiment
measures (y-axis)
ProportionsInverse Constant
Direct Squared
Direct
Indirect Squared
Scalars and Vectors
• Scalar – quantity with magnitude only• Vector – quantity with magnitude and
direction
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