Chapter 1, Introduction Physics Honors Homework Due —- Comple
McLaughlin, Katy, Food Reporter has reference to this Academic Journal, PHwiki organized this Journal Chapter 1, Introduction Physics Honors Homework Due —- Complete end of chapter problems: Begins on Pg. 27: 1, 2, 5, 7, 10, 11, 14, 15, 25, 26, 28, 37, 38, 45. By the end of today You will be able to tell other people what physics is all about. You will be able to explain the scientific method. You will be able to identify the SI units as long as the most common measurements. Day 1
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Physics: The most basic of all sciences! Physics: The Mother of all sciences! Physics = The study of the natural world. Examines matter in addition to energy in addition to how they interact. Things You Will Learn About in Physics http://commons.wikimedia.org/wiki/Image:Flyingsuperconductor.ogg velocity friction gravity Normal friction Sub Areas of Physics This Semester: Motion (MECHANICS) (most of our time!) Gravitation, Energy Second Semester: Electricity & magnetism Light, sound, optics, in addition to more
Physics: General Discussion Goal of Physics (& all of science): To quantitatively in addition to qualitatively describe the world around us. Physics IS NOT merely a collection of facts in addition to as long as mulas! Physics IS a creative activity! Physics Observation Explanation. Requires: Calculation & IMAGINATION How do Physicists come up with theories First, they observe a phenomenon in nature. They often use the scientific method: Recognize a problem Make a hypothesis- an educated guess Predict the consequences of the hypothesis Per as long as m experiments that test these predictions Conclusion: Formulate the simplest, general rule that organizes in addition to explains the hypothesis, prediction, in addition to experimental outcome. Scientific Method in Action! Car Crash Investigation: On the following slide, see if you can match the number or numbers on the right to the letter on the left
Match the number or numbers on the right to the letter on the left Investigator might order blood alcohol test, check car parts, or try to reproduce marks on the road. Investigator must reexamine evidence in addition to possibly revise hypothesis. 3) Examine scene in addition to fill out report. 4) Investigator goes to court, reexamines evidence, in addition to defends his theory. 5) Maybe the driver fell asleep, was drunk, speeding, a tire exploded, breaks did not work, Scientific Method Observe in addition to collect data Form in addition to objectively test hypotheses by experiments Interpret Results in addition to Revise Hypothesis if necessary. State Conclusions in a as long as m others can evaluate The Scientific Attitude Theories in science are not fixed. They may be supported by data in addition to test results, but they are not facts. Example: The Model of the Atom The reviewing in addition to changing of theories is a strength of science, in addition to the heart of the scientific method. No number of experiments can prove me right; a single experiment can prove me wrong. ~ Albert Einstein Chapter 1 Models Physics uses models that describe phenomena. A model is a pattern, plan, representation, or description designed to show the structure or workings of an object, system, or concept. A set of particles or interacting components considered to be a distinct physical entity as long as the purpose of study is called a system. Section 1 What Is Physics
Chapter 1 Hypotheses Models help scientists develop hypotheses. A hypothesis is an explanation that is based on prior scientific research or observations in addition to that can be tested. The process of simplifying in addition to modeling a situation can help you determine the relevant variables in addition to identify a hypothesis as long as testing. Section 1 What Is Physics Chapter 1 Hypotheses, continued Galileo modeled the behavior of falling objects in order to develop a hypothesis about how objects fall. If heavier objects fell faster than slower ones, would two bricks of different masses tied together fall slower (b) or faster (c) than the heavy brick alone (a) Because of this contradiction, Galileo hypothesized instead that all objects fall at the same rate, as in (d). Section 1 What Is Physics Looking Ahead The rest of this week we will focus on reviewing measuring techniques as long as acquiring data. We will also review some basic math (YIKES!) that will be important as long as you to master. Linear Motion will then be the first step in underst in addition to ing Mechanics the broad Physics topic that we will focus on as long as the first half of this course.
Graphing 101: A Complete Review Bell-ringer 9/1/09 What is an independent variable Where could you find it on a graph (which axis) A variable that you change or manipulate. Usually it is graphed on the x-axis. What is a dependent variable Where could you find it on a graph (which axis) A Variable that is not manipulated, but is observed ( in addition to often changes) as the independent variable is changed. Usually graphed on the y axis. Day 2 What’s Next LAB We will focus on recording accurate Data in addition to making logical Conclusions. Spring/Rubber B in addition to Activity Focus: Identifying Variables Collecting GOOD Data Accurately Reporting Data (tables in addition to graphs) Analyzing the Results
A BAD GRAPH! Complete your graph from the Pulse Race Lab. Determine the Reaction Time per Person on the back of your graph paper. Give the graph a title. Place labels on the x in addition to y axis. Show units on the x in addition to y axis. Do not play “connect the dots”. Use a best fit line – a straight line which goes through the points or a curve that tends to follow them. Steps to Improve the Graph A Better Graph! Y-Axis X-Axis Line of Best Fit Dependent Variable Independent Variable
Relationships Between Variables The simplest relationship between two variables is a straight line or linear relationship. y=mx+b slope-intercept equation shows this relationship! m= slope (change in y divided by change in x) Quick Review of Slope The slope of a line is defined as the rise over the run, m = y / x. Or m = (y1 y2) / (x1 X2) Change in Y Change in X means change Other Relationships Between Variables Inverse homepage.mac.com/cbakken/proportions/summary.html Quadratic (Square) y = ax2 + bx + c
Concluding Chapter 1 By the end of today, you must be able to: Identify SI base units in addition to Prefixes Convert measurements into scientific notation Distinguish accuracy from precision Day 3 Units: The SI System All measured physical quantities have units. Units are VITAL in physics!! In this course ( in addition to in most of the modern world, except the USA!) we will use (almost) exclusively the SI system of units. SI = Systéme International (French) SI or Metric System 5 Most Commonly used SI units Length unit: Meter (m) Time unit: Second (s) Mass unit: Kilogram (kg) Temperature unit: Celsius (C) Electric Current unit: Amperes (A)
Prefixes Sometimes we need to measure things that are either very big or very small. In addition to the SI units, prefixes in addition to scientific notation can be used to describe size. Larger & smaller units defined from SI st in addition to ards by powers of 10 & Greek prefixes How to use these prefixes Powers of 10 (Scientific Notation) It is common to express very large or very small numbers using powers of 10 notation. Examples: 3,960 = 3.96 103 = 3.96x10x10x10 (moved decimal 3 places to left) 0.0021 = 2.1 10-3 = 2.1/10/10/10 (moved decimal 3 places to right)
Section III Objectives Students will be able to: Use dimensional analysis to proof equations Use order of magnitude estimations to check whether answers are reasonable. Dimensional Analysis Example Density = mass / volume How could we use dimensional analysis to show that the equation: Volume = Density / mass is invalid Silent Reading & Quiz Students: Take 15-20 minutes to read pages 21-24 in addition to answer problems 2, 4, & 5 on page 25.
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