1. 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

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

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

4. 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

5. Section 1 What Is Physics?
Chapter 1
Models

6. 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.
Derived units - formed by combining the seven base units with multiplication or division.

7. Section 2 Measurements in Experiments
Chapter 1
SI Standards

8. Section 2 Measurements in Experiments
Chapter 1
SI Prefixes

9. 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.

10. 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

11. 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.

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

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

14. 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.

15. 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.

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

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

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

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

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

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

22. 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.

23. 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.

24. Section 3 The Language of Physics
Chapter 1
Interpreting Graphs

25. 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.