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1 About Science
Science is the study
of nature’s rules.
1 About Science
We can’t control
Earth’s motion, but we
have learned the rules
by which it moves.
The study of nature’s
rules is what this book
is about.
Understanding these
rules adds richness to
the way we see our
world.
1 About Science
Physics is about the nature of basic things such
as motion, forces, energy, matter, heat, sound,
light, and the composition of atoms.
1.1 The Basic Science—Physics
1 About Science
The study of science branches into the study of living things
and nonliving things.
• The life sciences include biology, zoology, and botany.
• The physical sciences include geology, astronomy,
chemistry, and physics.
1.1 The Basic Science—Physics
1 About Science
You can understand other sciences much better if you first
understand physics.
• Physics is the most basic of all the sciences.
• Chemistry is about how matter is put together.
• Biology is still more complex and involves matter that
is alive.
1.1 The Basic Science—Physics
1 About Science
What is physics about?
1.1 The Basic Science—Physics
1 About Science
When scientific findings in nature are expressed
mathematically, they are easier to verify or to
disprove by experiment.
1.2 Mathematics—The Language of Science
1 About Science
When the ideas of science are expressed in mathematical
terms, they are unambiguous.
The equations of science provide compact expressions of
relationships between concepts.
The methods of mathematics and experimentation have led
to enormous successes in science.
1.2 Mathematics—The Language of Science
1 About Science
Why is mathematics the language
of science?
1.2 Mathematics—The Language of Science
1 About Science
Scientific methods generally include some, if
not all, of the following:
1. Recognize a problem.
2. Make an educated guess—a hypothesis—
about the answer.
3. Predict the consequences of the hypothesis.
4. Perform experiments to test predictions.
5. Formulate the simplest general rule that
organizes the main ingredients: hypothesis,
prediction, and experimental outcome.
1.3 Scientific Methods
1 About Science
Scientific methods are extremely effective in gaining,
organizing, and applying new knowledge.
The scientific method is often credited to the Italian
physicist Galileo Galilei (a.) and the English philosopher
Francis Bacon (b.).
1.3 Scientific Methods
1 About Science
Although the scientific method is popular, it is not the
universal key to discoveries and advances in science.
• Trial and error, experimentation without guessing, and
accidental discovery account for much of the progress
in science.
• The success of science has more to do with an
attitude of inquiry, experimentation, and humility than
with a particular method.
1.3 Scientific Methods
1 About Science
What are the steps of a
scientific method?
1.3 Scientific Methods
1 About Science
If a scientist finds evidence that contradicts a
hypothesis, law, or principle, then the hypothesis,
law, or principle must be changed or abandoned.
1.4 The Scientific Attitude
1 About Science
In science, a fact is a close agreement by competent
observers who make a series of observations of the same
phenomenon.
A scientific hypothesis is an educated guess that is not
fully accepted until demonstrated by experiment.
When hypotheses about the relationship among natural
quantities are tested over and over again and not
contradicted, they may become laws or principles.
1.4 The Scientific Attitude
1 About Science
Scientists must accept their findings even when they would
like them to be different. They must distinguish between
what they see and what they wish to see.
1.4 The Scientific Attitude
1 About Science
Scientific Theories
A scientific theory is a synthesis of a large body of
information that encompasses well-tested and verified
hypotheses about certain aspects of the natural world.
1.4 The Scientific Attitude
1 About Science
The theories of science evolve as
they go through stages of redefinition
and refinement.
• The refinement of theories is a
strength of science, not a
weakness.
• More important than defending
beliefs is improving upon them.
• Better hypotheses are made by
those who are honest in the
face of experimental evidence.
1.4 The Scientific Attitude
1 About Science
When must a hypothesis, law, or
principle be changed or abandoned?
1.4 The Scientific Attitude
1 About Science
To determine whether a hypothesis is
scientific or not, look to see if there is a
test for proving it wrong.
1.5 Scientific Hypotheses
1 About Science
A scientific hypothesis must be testable.
• It is more important that there be a way of proving it
wrong than that there be a way of proving it correct.
• If there is no test for its possible wrongness, then it is
not scientific.
1.5 Scientific Hypotheses
1 About Science
Here is a hypothesis that is scientific:
“No material object can travel faster than light.”
Even if it were supported by a thousand other experiments,
this hypothesis could be proven wrong by a single
experiment. (So far, we find it to be true.)
1.5 Scientific Hypotheses
1 About Science
Here are hypotheses that are not scientific:
• The hypothesis: “The alignment of planets in the sky
determines the best time for making decisions” cannot
be proven wrong, nor can it be proven right. It is
speculation.
• The hypothesis: “Intelligent life exists on other planets
somewhere in the universe” can be proven correct, but
there is no way to prove it wrong if no life is ever found.
• The hypothesis: “Most people stop for red lights”
doesn’t link up to our general understanding of nature,
so it doesn’t fit into the structure of science.
1.5 Scientific Hypotheses
1 About Science
Experiments are conducted to test scientific hypotheses.
1.5 Scientific Hypotheses
1 About Science
think!
Which of these is a scientific hypothesis?
a. Atoms are the smallest particles of matter.
b. The universe is surrounded by a second universe, the
existence of which cannot be detected by scientists.
c. Albert Einstein was the greatest physicist of the 1900s.
1.5 Scientific Hypotheses
1 About Science
think!
Which of these is a scientific hypothesis?
a. Atoms are the smallest particles of matter.
b. The universe is surrounded by a second universe, the
existence of which cannot be detected by scientists.
c. Albert Einstein was the greatest physicist of the 1900s.
Answer:
(a) is scientific, because there is a test for its wrongness.
(b) has no test for possible wrongness and is therefore
unscientific.
(c) is an assertion that has no test for possible wrongness.
1.5 Scientific Hypotheses
1 About Science
How do you know if a
hypothesis is scientific?
1.5 Scientific Hypotheses
1 About Science
Science is a method of answering
theoretical questions; technology is a
method of solving practical problems.
1.6 Science, Technology, and Society
1 About Science
Science has to do with
discovering facts and
relationships between observable
phenomena in nature and with
establishing theories that
organize and make sense of
these facts and relationships.
Technology has to do with tools,
techniques, and procedures for
putting the findings of science to
use.
1.6 Science, Technology, and Society
1 About Science
1.6 Science, Technology, and Society
Science and technology make
up a larger part of our everyday
lives than ever before.
The scientific way of thinking
becomes vital to society as new
facts are discovered and new
ideas for caring for the planet
are needed.
1 About Science
What is the difference between
science and technology?
1.6 Science, Technology, and Society
1 About Science
Science is mostly concerned with
discovering and recording natural
phenomena, the arts are concerned with
the value of human interactions as they
pertain to the senses, and religion is
concerned with the source, purpose, and
meaning of everything.
1.7 Science, Art, and Religion
1 About Science
The domains of science, art, and
religion are different, even though
they overlap.
• The domain of science is
natural order.
• The domain of religion is
nature’s purpose.
1.7 Science, Art, and Religion
1 About Science
The principal values of science and the arts are comparable.
• Literature describes the human experience. The arts do
not necessarily give us experiences, but they describe
them to us and suggest what may be in store for us.
• Science tells us what is possible in nature. Scientific
knowledge helps us to predict possibilities in nature even
before these possibilities have been experienced.
1.7 Science, Art, and Religion
1 About Science
think!
Which of the following involves great amounts of human
passion, talent, and intelligence?
a. art
b. literature
c. music
d. science
1.7 Science, Art, and Religion
1 About Science
think!
Which of the following involves great amounts of human
passion, talent, and intelligence?
a. art
b. literature
c. music
d. science
Answer:
All of them!
1.7 Science, Art, and Religion
1 About Science
How are science, art, and
religion different?
1.7 Science, Art, and Religion
1 About Science
Progress in our age is much quicker than it
was thousands of years ago.
1.8 In Perspective
1 About Science
The pyramids testify to human genius, endurance, and thirst
for deeper understanding.
A few centuries ago, cathedrals, synagogues, temples, and
mosques were manifestations of people’s vision.
This enormous focus of human energy was inspired by a
vision that went beyond world concerns—a vision of the
cosmos.
1.8 In Perspective
1 About Science
Today the efforts of many of our
most skilled scientists,
engineers, and artisans are
directed toward building the
spaceships that orbit Earth.
Many people working on
today’s spaceships were alive
before the first jetliner carried
passengers. Where will
younger lives lead in a
comparable time?
1.8 In Perspective
1 About Science
Astronauts may
one day travel in
this spaceship of
the future.
1.8 In Perspective
1 About Science
How does progress today differ from
progress thousands of years ago?
1.8 In Perspective
1 About Science
1. The science that is basic to the other sciences is
a. physics.
b. chemistry.
c. biology.
d. astronomy.
Assessment Questions
1 About Science
1. The science that is basic to the other sciences is
a. physics.
b. chemistry.
c. biology.
d. astronomy.
Answer: A
Assessment Questions
1 About Science
2. The language of science is
a. mathematics.
b. nature.
c. common language.
d. English.
Assessment Questions
1 About Science
2. The language of science is
a. mathematics.
b. nature.
c. common language.
d. English.
Answer: A
Assessment Questions
1 About Science
3. The classic scientific method, followed by Galileo and Bacon,
a. is the method guaranteed to lead to scientific discoveries.
b. is one of many ways that scientific discoveries are made.
c. is today outmoded, and of little value.
d. required memorization.
Assessment Questions
1 About Science
3. The classic scientific method, followed by Galileo and Bacon,
a. is the method guaranteed to lead to scientific discoveries.
b. is one of many ways that scientific discoveries are made.
c. is today outmoded, and of little value.
d. required memorization.
Answer: B
Assessment Questions
1 About Science
4. When someone says, “That’s only a theory,” that person likely doesn’t
know that a scientific theory is a(n)
a. guess that involves a bunch of facts.
b. type of hypothesis.
c. vast synthesis of well-tested hypotheses and facts.
d. untested explanation.
Assessment Questions
1 About Science
4. When someone says, “That’s only a theory,” that person likely doesn’t
know that a scientific theory is a(n)
a. guess that involves a bunch of facts.
b. type of hypothesis.
c. vast synthesis of well-tested hypotheses and facts.
d. untested explanation.
Answer: C
Assessment Questions
1 About Science
5. For a hypothesis to be scientific, it must
a. be in agreement with what we know is true.
b. have a test for proving it right.
c. have a test for proving it wrong.
d. be based on an existing scientific theory.
Assessment Questions
1 About Science
5. For a hypothesis to be scientific, it must
a. be in agreement with what we know is true.
b. have a test for proving it right.
c. have a test for proving it wrong.
d. be based on an existing scientific theory.
Answer: C
Assessment Questions
1 About Science
6. Technology is a
a. body of scientific knowledge.
b. tool of science.
c. form of science.
d. solution to all of humankind’s problems.
Assessment Questions
1 About Science
6. Technology is a
a. body of scientific knowledge.
b. tool of science.
c. form of science.
d. solution to all of humankind’s problems.
Answer: B
Assessment Questions
1 About Science
7. Science differs from art and religion because it
a. describes the human experience.
b. discovers and records natural phenomena.
c. describes the source, purpose, and meaning of everything.
d. is based on faith.
Assessment Questions
1 About Science
7. Science differs from art and religion because it
a. describes the human experience.
b. discovers and records natural phenomena.
c. describes the source, purpose, and meaning of everything.
d. is based on faith.
Answer: B
Assessment Questions
1 About Science
8. Which of the following statements about progress today compared
with progress centuries ago is true?
a. Progress today is slower than it was centuries ago.
b. Progress today is faster than it was centuries ago.
c. Progress today is the same as it was centuries ago.
d. There is no way to determine if progress today differs from
progress centuries ago.
Assessment Questions
1 About Science
8. Which of the following statements about progress today compared
with progress centuries ago is true?
a. Progress today is slower than it was centuries ago.
b. Progress today is faster than it was centuries ago.
c. Progress today is the same as it was centuries ago.
d. There is no way to determine if progress today differs from
progress centuries ago.
Answer: B
Assessment Questions

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Chapter 1 Introduction to Science- Physics

  • 1. 1 About Science Science is the study of nature’s rules.
  • 2. 1 About Science We can’t control Earth’s motion, but we have learned the rules by which it moves. The study of nature’s rules is what this book is about. Understanding these rules adds richness to the way we see our world.
  • 3. 1 About Science Physics is about the nature of basic things such as motion, forces, energy, matter, heat, sound, light, and the composition of atoms. 1.1 The Basic Science—Physics
  • 4. 1 About Science The study of science branches into the study of living things and nonliving things. • The life sciences include biology, zoology, and botany. • The physical sciences include geology, astronomy, chemistry, and physics. 1.1 The Basic Science—Physics
  • 5. 1 About Science You can understand other sciences much better if you first understand physics. • Physics is the most basic of all the sciences. • Chemistry is about how matter is put together. • Biology is still more complex and involves matter that is alive. 1.1 The Basic Science—Physics
  • 6. 1 About Science What is physics about? 1.1 The Basic Science—Physics
  • 7. 1 About Science When scientific findings in nature are expressed mathematically, they are easier to verify or to disprove by experiment. 1.2 Mathematics—The Language of Science
  • 8. 1 About Science When the ideas of science are expressed in mathematical terms, they are unambiguous. The equations of science provide compact expressions of relationships between concepts. The methods of mathematics and experimentation have led to enormous successes in science. 1.2 Mathematics—The Language of Science
  • 9. 1 About Science Why is mathematics the language of science? 1.2 Mathematics—The Language of Science
  • 10. 1 About Science Scientific methods generally include some, if not all, of the following: 1. Recognize a problem. 2. Make an educated guess—a hypothesis— about the answer. 3. Predict the consequences of the hypothesis. 4. Perform experiments to test predictions. 5. Formulate the simplest general rule that organizes the main ingredients: hypothesis, prediction, and experimental outcome. 1.3 Scientific Methods
  • 11. 1 About Science Scientific methods are extremely effective in gaining, organizing, and applying new knowledge. The scientific method is often credited to the Italian physicist Galileo Galilei (a.) and the English philosopher Francis Bacon (b.). 1.3 Scientific Methods
  • 12. 1 About Science Although the scientific method is popular, it is not the universal key to discoveries and advances in science. • Trial and error, experimentation without guessing, and accidental discovery account for much of the progress in science. • The success of science has more to do with an attitude of inquiry, experimentation, and humility than with a particular method. 1.3 Scientific Methods
  • 13. 1 About Science What are the steps of a scientific method? 1.3 Scientific Methods
  • 14. 1 About Science If a scientist finds evidence that contradicts a hypothesis, law, or principle, then the hypothesis, law, or principle must be changed or abandoned. 1.4 The Scientific Attitude
  • 15. 1 About Science In science, a fact is a close agreement by competent observers who make a series of observations of the same phenomenon. A scientific hypothesis is an educated guess that is not fully accepted until demonstrated by experiment. When hypotheses about the relationship among natural quantities are tested over and over again and not contradicted, they may become laws or principles. 1.4 The Scientific Attitude
  • 16. 1 About Science Scientists must accept their findings even when they would like them to be different. They must distinguish between what they see and what they wish to see. 1.4 The Scientific Attitude
  • 17. 1 About Science Scientific Theories A scientific theory is a synthesis of a large body of information that encompasses well-tested and verified hypotheses about certain aspects of the natural world. 1.4 The Scientific Attitude
  • 18. 1 About Science The theories of science evolve as they go through stages of redefinition and refinement. • The refinement of theories is a strength of science, not a weakness. • More important than defending beliefs is improving upon them. • Better hypotheses are made by those who are honest in the face of experimental evidence. 1.4 The Scientific Attitude
  • 19. 1 About Science When must a hypothesis, law, or principle be changed or abandoned? 1.4 The Scientific Attitude
  • 20. 1 About Science To determine whether a hypothesis is scientific or not, look to see if there is a test for proving it wrong. 1.5 Scientific Hypotheses
  • 21. 1 About Science A scientific hypothesis must be testable. • It is more important that there be a way of proving it wrong than that there be a way of proving it correct. • If there is no test for its possible wrongness, then it is not scientific. 1.5 Scientific Hypotheses
  • 22. 1 About Science Here is a hypothesis that is scientific: “No material object can travel faster than light.” Even if it were supported by a thousand other experiments, this hypothesis could be proven wrong by a single experiment. (So far, we find it to be true.) 1.5 Scientific Hypotheses
  • 23. 1 About Science Here are hypotheses that are not scientific: • The hypothesis: “The alignment of planets in the sky determines the best time for making decisions” cannot be proven wrong, nor can it be proven right. It is speculation. • The hypothesis: “Intelligent life exists on other planets somewhere in the universe” can be proven correct, but there is no way to prove it wrong if no life is ever found. • The hypothesis: “Most people stop for red lights” doesn’t link up to our general understanding of nature, so it doesn’t fit into the structure of science. 1.5 Scientific Hypotheses
  • 24. 1 About Science Experiments are conducted to test scientific hypotheses. 1.5 Scientific Hypotheses
  • 25. 1 About Science think! Which of these is a scientific hypothesis? a. Atoms are the smallest particles of matter. b. The universe is surrounded by a second universe, the existence of which cannot be detected by scientists. c. Albert Einstein was the greatest physicist of the 1900s. 1.5 Scientific Hypotheses
  • 26. 1 About Science think! Which of these is a scientific hypothesis? a. Atoms are the smallest particles of matter. b. The universe is surrounded by a second universe, the existence of which cannot be detected by scientists. c. Albert Einstein was the greatest physicist of the 1900s. Answer: (a) is scientific, because there is a test for its wrongness. (b) has no test for possible wrongness and is therefore unscientific. (c) is an assertion that has no test for possible wrongness. 1.5 Scientific Hypotheses
  • 27. 1 About Science How do you know if a hypothesis is scientific? 1.5 Scientific Hypotheses
  • 28. 1 About Science Science is a method of answering theoretical questions; technology is a method of solving practical problems. 1.6 Science, Technology, and Society
  • 29. 1 About Science Science has to do with discovering facts and relationships between observable phenomena in nature and with establishing theories that organize and make sense of these facts and relationships. Technology has to do with tools, techniques, and procedures for putting the findings of science to use. 1.6 Science, Technology, and Society
  • 30. 1 About Science 1.6 Science, Technology, and Society Science and technology make up a larger part of our everyday lives than ever before. The scientific way of thinking becomes vital to society as new facts are discovered and new ideas for caring for the planet are needed.
  • 31. 1 About Science What is the difference between science and technology? 1.6 Science, Technology, and Society
  • 32. 1 About Science Science is mostly concerned with discovering and recording natural phenomena, the arts are concerned with the value of human interactions as they pertain to the senses, and religion is concerned with the source, purpose, and meaning of everything. 1.7 Science, Art, and Religion
  • 33. 1 About Science The domains of science, art, and religion are different, even though they overlap. • The domain of science is natural order. • The domain of religion is nature’s purpose. 1.7 Science, Art, and Religion
  • 34. 1 About Science The principal values of science and the arts are comparable. • Literature describes the human experience. The arts do not necessarily give us experiences, but they describe them to us and suggest what may be in store for us. • Science tells us what is possible in nature. Scientific knowledge helps us to predict possibilities in nature even before these possibilities have been experienced. 1.7 Science, Art, and Religion
  • 35. 1 About Science think! Which of the following involves great amounts of human passion, talent, and intelligence? a. art b. literature c. music d. science 1.7 Science, Art, and Religion
  • 36. 1 About Science think! Which of the following involves great amounts of human passion, talent, and intelligence? a. art b. literature c. music d. science Answer: All of them! 1.7 Science, Art, and Religion
  • 37. 1 About Science How are science, art, and religion different? 1.7 Science, Art, and Religion
  • 38. 1 About Science Progress in our age is much quicker than it was thousands of years ago. 1.8 In Perspective
  • 39. 1 About Science The pyramids testify to human genius, endurance, and thirst for deeper understanding. A few centuries ago, cathedrals, synagogues, temples, and mosques were manifestations of people’s vision. This enormous focus of human energy was inspired by a vision that went beyond world concerns—a vision of the cosmos. 1.8 In Perspective
  • 40. 1 About Science Today the efforts of many of our most skilled scientists, engineers, and artisans are directed toward building the spaceships that orbit Earth. Many people working on today’s spaceships were alive before the first jetliner carried passengers. Where will younger lives lead in a comparable time? 1.8 In Perspective
  • 41. 1 About Science Astronauts may one day travel in this spaceship of the future. 1.8 In Perspective
  • 42. 1 About Science How does progress today differ from progress thousands of years ago? 1.8 In Perspective
  • 43. 1 About Science 1. The science that is basic to the other sciences is a. physics. b. chemistry. c. biology. d. astronomy. Assessment Questions
  • 44. 1 About Science 1. The science that is basic to the other sciences is a. physics. b. chemistry. c. biology. d. astronomy. Answer: A Assessment Questions
  • 45. 1 About Science 2. The language of science is a. mathematics. b. nature. c. common language. d. English. Assessment Questions
  • 46. 1 About Science 2. The language of science is a. mathematics. b. nature. c. common language. d. English. Answer: A Assessment Questions
  • 47. 1 About Science 3. The classic scientific method, followed by Galileo and Bacon, a. is the method guaranteed to lead to scientific discoveries. b. is one of many ways that scientific discoveries are made. c. is today outmoded, and of little value. d. required memorization. Assessment Questions
  • 48. 1 About Science 3. The classic scientific method, followed by Galileo and Bacon, a. is the method guaranteed to lead to scientific discoveries. b. is one of many ways that scientific discoveries are made. c. is today outmoded, and of little value. d. required memorization. Answer: B Assessment Questions
  • 49. 1 About Science 4. When someone says, “That’s only a theory,” that person likely doesn’t know that a scientific theory is a(n) a. guess that involves a bunch of facts. b. type of hypothesis. c. vast synthesis of well-tested hypotheses and facts. d. untested explanation. Assessment Questions
  • 50. 1 About Science 4. When someone says, “That’s only a theory,” that person likely doesn’t know that a scientific theory is a(n) a. guess that involves a bunch of facts. b. type of hypothesis. c. vast synthesis of well-tested hypotheses and facts. d. untested explanation. Answer: C Assessment Questions
  • 51. 1 About Science 5. For a hypothesis to be scientific, it must a. be in agreement with what we know is true. b. have a test for proving it right. c. have a test for proving it wrong. d. be based on an existing scientific theory. Assessment Questions
  • 52. 1 About Science 5. For a hypothesis to be scientific, it must a. be in agreement with what we know is true. b. have a test for proving it right. c. have a test for proving it wrong. d. be based on an existing scientific theory. Answer: C Assessment Questions
  • 53. 1 About Science 6. Technology is a a. body of scientific knowledge. b. tool of science. c. form of science. d. solution to all of humankind’s problems. Assessment Questions
  • 54. 1 About Science 6. Technology is a a. body of scientific knowledge. b. tool of science. c. form of science. d. solution to all of humankind’s problems. Answer: B Assessment Questions
  • 55. 1 About Science 7. Science differs from art and religion because it a. describes the human experience. b. discovers and records natural phenomena. c. describes the source, purpose, and meaning of everything. d. is based on faith. Assessment Questions
  • 56. 1 About Science 7. Science differs from art and religion because it a. describes the human experience. b. discovers and records natural phenomena. c. describes the source, purpose, and meaning of everything. d. is based on faith. Answer: B Assessment Questions
  • 57. 1 About Science 8. Which of the following statements about progress today compared with progress centuries ago is true? a. Progress today is slower than it was centuries ago. b. Progress today is faster than it was centuries ago. c. Progress today is the same as it was centuries ago. d. There is no way to determine if progress today differs from progress centuries ago. Assessment Questions
  • 58. 1 About Science 8. Which of the following statements about progress today compared with progress centuries ago is true? a. Progress today is slower than it was centuries ago. b. Progress today is faster than it was centuries ago. c. Progress today is the same as it was centuries ago. d. There is no way to determine if progress today differs from progress centuries ago. Answer: B Assessment Questions