Chapter 1 Table of Contents Section 1 What Is Physics? The Science of Physics Table of Contents Section 1 What Is Physics? Section 2 Measurements in Experiments Section 3 The Language of Physics

The Branches of Physics Section 1 What Is Physics? Chapter 1 The Branches of Physics

Physics and Technology Section 1 What Is Physics? Chapter 1 Physics and Technology

Section 1 What Is Physics? Chapter 1 Models Model - pattern, plan, representation, or description designed to show the structure or workings of an object, system, or concept. System - set of particles or interacting components considered to be a distinct physical entity for the purpose of study

Section 1 What Is Physics? Chapter 1 Models

Numbers as Measurements Section 2 Measurements in Experiments Chapter 1 Numbers as Measurements SI - standard measurement system for science seven base units - each base unit describes a single dimension, such as length, mass, or time. http://physics.nist.gov/cuu/Units/units.html Derived units - formed by combining the seven base units with multiplication or division.

Section 2 Measurements in Experiments Chapter 1 SI Standards

Section 2 Measurements in Experiments Chapter 1 SI Prefixes

Chapter 1 Dimensions and Units Section 2 Measurements in Experiments Chapter 1 Dimensions and Units Measurements used in calculations must have the correct dimension, and also have the same units. For example, when determining area by multiplying length and width, be sure the measurements are expressed in the same units.

Chapter 1 Sample Problem Section 2 Measurements in Experiments Chapter 1 Sample Problem A typical bacterium has a mass of about 2.0 fg. Express this measurement in terms of grams and kilograms. Given: mass = 2.0 fg Unknown: mass = ? g mass = ? kg

Accuracy and Precision Section 2 Measurements in Experiments Chapter 1 Accuracy and Precision Accuracy - description of how close a measurement is to the correct or accepted value Precision - degree of exactness of a measurement.

Accuracy and Precision Section 2 Measurements in Experiments Chapter 1 Accuracy and Precision

Measurement and Parallax Section 2 Measurements in Experiments Chapter 1 Measurement and Parallax

Chapter 1 Significant Figures Section 2 Measurements in Experiments Chapter 1 Significant Figures Significant figures - digits in a measurement that are known with certainty plus the first digit that is uncertain.

Chapter 1 Significant Figures Section 2 Measurements in Experiments Chapter 1 Significant Figures Even though this ruler is marked in only centimeters and half-centimeters, if you estimate, you can use it to report measurements to a precision of a millimeter.

Rules for Determining Significant Zeroes Section 2 Measurements in Experiments Chapter 1 Rules for Determining Significant Zeroes

Rules for Determining Significant Zeros Section 2 Measurements in Experiments Chapter 1 Rules for Determining Significant Zeros

Rules for Calculating with Significant Figures Section 2 Measurements in Experiments Chapter 1 Rules for Calculating with Significant Figures

Rules for Rounding in Calculations Section 2 Measurements in Experiments Chapter 1 Rules for Rounding in Calculations

Rules for Rounding in Calculations Section 2 Measurements in Experiments Chapter 1 Rules for Rounding in Calculations

Mathematics and Physics Section 3 The Language of Physics Chapter 1 Mathematics and Physics Tables, graphs, and equations can make data easier to understand.

Data from Dropped-Ball Experiment Section 3 The Language of Physics Chapter 1 Data from Dropped-Ball Experiment A clear trend can be seen in the data. The more time that passes after each ball is dropped, the farther the ball falls.

Graph from Dropped-Ball Experiment Section 3 The Language of Physics Chapter 1 Graph from Dropped-Ball Experiment One method for analyzing the data is to construct a graph of the distance the balls have fallen versus the elapsed time since they were released. The shape of the graph provides information about the relationship between time and distance.

Section 3 The Language of Physics Chapter 1 Interpreting Graphs

Chapter 1 Physics Equations Section 3 The Language of Physics Chapter 1 Physics Equations Variables and other specific quantities are abbreviated with letters that are boldfaced or italicized. Units are abbreviated with regular letters, sometimes called roman letters. Two tools for evaluating physics equations are dimensional analysis and order-of-magnitude estimates.