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## What is Physics Scientific Methods Mathematics in Physics SI Units Prefixes Used with SI Units

Parente, Michele, Food and Wine Writer has reference to this Academic Journal, PHwiki organized this Journal Chapter 1 Mathematics in addition to Physics Chapter 1 Section 1 What is Physics The branch of science that studies the physical world. It involves the study of energy, matter, in addition to how the two are related.

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Scientific Methods Scientific Law Scientific Theories A rule of nature that sums up related observations to describe a pattern in nature. Laws do not explain WHY these phenomena occur, they simply describe them. Ex. The Law of Universal Gravitation An explanation based on many observations supported by experimental results. Theories may serve as explanations as long as laws. Ex. The Theory of Universal Gravitation Mathematics in Physics Physics often uses mathematics as its language. This chapter offers a set of math skills you will be useful throughout the course. SI Units You will use SI units as long as everything during this course. The 7 base units are listed in the table to the right. (table also on p.5)

Prefixes Used with SI Units table also found on p.6 Dimensional Analysis The method of treating unit as algebraic quantities that can be cancelled. How Choose a conversion factor that will make the units you dont want cancel, in addition to the units you do want stay in the answer. = 30,000 m Significant Figures Sig figs are the valid digits in a measurement. Remember when doing calculations with sig figs your answer cannot be more precise than the least precise measurement. All answers on tests, quizzes, labs, etc. must have the proper amount of sig figs.

Sig Fig Rules Determining the Number of Sig Figs in a Measurement Remember these four rules: Nonzero digits are always significant. All final zeros after the decimal point are significant. Zeros between two other significant digits are always significant. Zeros solely used a placeholders are NOT significant. Operations Using Sig Figs Addition & Subtraction Example: To add or subtract measurements, first per as long as m the operation, in addition to then round off the result to correspond to the least precise value involved. Add 24.686 m + 2.343 m + 3.21 m. Just add the measurements. 24.686 m + 2.343 m + 3.21 m = 30.239 m Round to the least precise measurement. 3.21 m is the least precise, so round to two decimal places: 30.24 m Operations Using Sig Figs Multiplication & Division Example: To multiply or divide measurements, first per as long as m the operation, in addition to then note the measurement with the least number of sig figs. Round the product or quotient to this number of digits. Multiply 3.22 cm by 2.1 cm. Just multiply the measurements. 3.22 cm x 2.1 cm = 6.762 cm2 Round the product to the same number of digits as the measurement with the least amount of sig figs. 3.22 cm has 3, 2.1 cm has 2, so, round to 2 digits 6.8 cm2

Homework pg. 7 , 5-8 pg. 8, 9-12 (use the correct of sig figs) Measurement Chapter 1 Section 2 Measurement A comparison between an unknown quantity in addition to a st in addition to ard.

Characteristics of Measured Values Precision Accuracy The degree of exactness of a measurement. Depends on the instrument in addition to the technique used to make the measurement. Describes how well the results of a measurement agree with the real value (the accepted value as measured by skilled experimenters). Sig Figs in addition to Precision Sig figs in an answer show its precision. Example: A measure of 80.05 g is precise to the nearest hundredth of a gram. The precision of a measurement is one-half the smallest division on the instrument. Example: The graduated cylinder at the left has divisions of 1mL. This means that this instrument has a precision of 0.5mL. Techniques of Good Measurement Know how to use the instrument you are using to obtain measurements. Use the instrument correctly. H in addition to le instruments with care, to avoid damage. Always zero the instrument if necessary. Look straight at the markings at eye-level to avoid a parallax. Parallax the apparent shift in the position of an object when it is viewed from different angles.

Chapter 1 Section 3 Graphing Data We will not as long as mally take notes on 1.3. HOWEVER, you will be: Assessed on the in as long as mation contained in 1.3 on the Ch.1 Test. Expected to use the skills from this section throughout the course. What You Need To Know from 1.3 It is expected that you already know how to do the following: Graph the relationship between independent in addition to dependent variables. Be able to interpret graphs. Be able to recognize common relationships in graphs. Please make sure you know the following key terms from 1.3: independent variable dependent variable line of best fit linear relationship quadratic relationship inverse relationship slope Homework Do the following questions Due tomorrow Page 14 Section Review Questions 18, 20, & 23 Page 18 Practice Problem 24 Page 19 Section Review Questions 26-29 Do the questions using the following Transparency Worksheets Due tomorrow Transparency 1-3 Transparency 1-4

Chapter 1 Test Friday, September 7, 2012 The following will be on the test: 1.1 Mathematics in addition to Physics 1.2 Measurement 1.3 Graphing Data

## Parente, Michele Food and Wine Writer

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