Review Concepts for Physics. By: Mrs. K. Smith. Homework. Read chapter 1: Be sure to look at pictures, bold print, italic, margin notes Be sure to define the vocabulary on page 26 of your Physics text Due tomorrow. Topics of Physics. Mechanics Thermodynamics
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Review Concepts for Physics By: Mrs. K. Smith
Homework • Read chapter 1: Be sure to look at pictures, bold print, italic, margin notes • Be sure to define the vocabulary on page 26 of your Physics text • Due tomorrow
Topics of Physics • Mechanics • Thermodynamics • Vibrations and wave phenomena • Optics • Electromagnetism • Relativity • Quantum Mechanics
Develop a mneumonic to remember the topics of physics • Example: HOMES This is used to remember the Great Lakes. Can you name the 5 lakes?????? Huron, Ontario, Michigan, Erie, Superior
The Scientific Method • Observation • Hypothesis • Evaluate • Interpret • Conclusion
Learning Check Numbered Heads Activity • Left side of desk are # ones, right side are #2 • You have 30 seconds to whisper your partner (s) the answer • #1’s List the topics of physics to #2 • #2’s list the steps to the scientific method
CSI Activity In a group of two or less you will … • Develop a crime scene and story line for CSI • Show how the scientific method is being used in your crime scene • Create a visual ie: power point, video • Place your video or power point on wiki page/Review 5. Present your project to the class 6. Your grade will be based on the rubric.
Scientific Notation • Scientific Notation is a short hand method of writing very large or very small numbers • Keep only one digit to the left of the decimal Examples: • 12,300,000,000,000 = 1.23 X 10 13 • 0.000,000,005,6 = 5.6 X 10 -9
Scientific Notation Operations Add/ subtraction – exponents must be the same Multiplication - exponents are added Division – exponents are subtracted ( top down) • Need more of a review of scientific notation
Prefixes • root units : meter liter gram • Base units are meter, kilogram, second,… (see table 2 on page 11) Kilo hecto Deka (root) deci centi milli K H Da d c m 1000 100 10 1 0.1 0.01 0.001 103 102 101 100 10-1 10-2 10-3
Prefix Activity • On the strip of paper given fold in half. • In the middle mark the root units. • On the left side start with 1018 and mark 18 segments to the middle where the root units are. • Mark another 18 units to the right to 10-18. • In the last segment on the left mark 1018 and exa, mark 1017 in the next and so on. • After you mark 10 15 mark the prefix peta. • Continue this until all the powers and prefixes are marked.
Units • There are several measuring systems • English • Cgs (very small) • Avoirdupois (ballistics) • SI
Unit History • History and practice
Mars Orbiter Mission • Read the story on page 13. • Activity • Determine the distance from your home to school in miles. Calculate how far short of the school if you traveled the same number of kilometers along the same route.
Learning Check • Quiz time
Counting Sig Figs • All nonzero numbers are significant as well as zeros between significant numbers 5087 • (4) • Zeros in front of nonzero digits are not significant 0.0543 • (3) • Zeros at the end of a number and also to the right of the decimal are significant. 67.00 • (4) • Zeros at the end of the number but to the left of a decimal are significant if they have been measured or are the first estimated digit 100. • 3
Significant Figures • Operations • Add/Sub – to the least precise digit 40.5 + 5.23 = 45.73 round to 45.7 Mult/ Div - lesser number of sig figs 123 X 5.35 = 658.05 round to 658 Practice Activity
Precision vs Accuracy • Precision • The degree of exactness of a measurement • Accuracy • A description of how close a measurement is to the correct or accepted value of the quantity measured
EXERCISE • The following students measure the density of a piece of lead three times. The density of lead is actually 11.34 g/cm3. Considering all of the results, which person’s results were accurate? Which were precise ? Were any both accurate and precise? • A.Rachel: 11.32 g/cm3, 11.35 g/cm3, 11.33 g/cm3 • Both accurate and precise • B. Daniel: 11.43 g/cm3, 11.44 g/cm3, 11.42 g/cm3 • precise • C. Leah: 11.55 g/cm3, 11.34 g/cm3, 11.04 g/cm3 • neither
Controlled experiments • An experiment that tests only one factor at a time by using a comparison of a control group with an experimental group • Mousetrap Car Project
Graphing • Need a review • General information on graphing • Graphing for physics (Clemson University) • Check this site out to see examples of physics labs at the university level • Practice Activity
Dimensional Analysis • Animal worksheet 1 cow X 2pigs X 20 chickens X 2 b peas 1 cow 1pig 1 chicken X 3 rabbits X 12 pumpkins X 1 turkey 2 b peas 5 rabbits 6 pumpkins X 3 b apples X 1 b crabs = 36 b crabs • 1 turkey 4 b apples
Dimensional Analysis • 88 km X 1000 m X 1 h = 24 m h 1 km 3600 s s Basic dimensional analysis Practice Worksheet
Order of Magnitude • How many leaves does this tree have? • The leafy part of the tree is sort of a square. So approximate the volume (L X w X h), • 10 m X 10 m X 10m = 1 X 103 m3. • Approx.10 leaves are in one meter and there are 10 m in each dimension so 100 leaves per each dimension or 10 X 10 X 10 = 1 X 103
Orders of Magnitude 1 X 103m3 X 1 X 103leaves = 1 X 10 6leaves tree m3 tree • You are in charge of the Gatorade for the season. How many containers, powder that make 5 gallons, do you need? • Let’s say the team use 3 big 5 gallon containers per half so 6 – 5 gal containers and there are 12 games. If you are in charge of practice you figure it out like below and then total games and practices 6- 5 gal containers X 1 powder container X 12 games = game 5 gal container season 72 powder containers / season
Order of Magnitude • Practice Activity • If you need some more examples of Order of Magnitude
One More Section • We are starting the last section so a test is coming up soon. • If you haven’t started the Review Sheet start it now.
Rearranging Equations • Use the reverse order to rearrange • sq root then square or Add/ sub or mult/div • You need m Y –b = mx Y – b / x = m • Practice Activity • Need another example ?
LEARNING CHECK • Quiz time
Chapter Test • Be sure to complete the review sheet, read the chapter, review the vocab, worksheets and this power point. • Your test will consist of 20 questions – 60 pt. You will be tested on theory as well as problems. Most are multiple choice but there are also essay questions. You will need a calculator. • Before the test you will perform a lab. You will be given two class periods to complete the lab. If not complete it is homework. After the two lab days the class will take the test.
Lab Work • Need help with a vernier caliper