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Unit 1- Nature of Science Period 4
Transcript of Unit 1- Nature of Science Period 4
What Is Science? SC.8.N.1.6 Understand that scientific investigations involve the collection of relevant empirical evidence, the use of logical reasoning, and the application of imagination in devising hypotheses, predictions, explanations and models to make sense of the collected evidence.
SC.8.N.2.1 Distinguish between scientific and pseudoscientific ideas.
SC.8.N.2.2 Discuss what characterizes science and its methods. What characterizes science? Character Witness Science is the systematic study of natural events and conditions. There are three main types of science: biology, geology, and physical science. Life science, or biology, is the study of living things.
Earth science, or geology, is the study of the surface and interior of Earth.
Physical science is the study of energy and nonliving matter. Physical science includes physics and chemistry.
All branches of science have some characteristics in common.
All kinds of scientists must share and discuss their results
All scientific ideas must be testable and reproducible. What characterizes science? Scientific evidence must be observable by all scientists. It must not be based on opinions or feelings.
Empirical evidence is observations, measurements, and data that scientists gather to support an explanation.
Scientists commonly use tools to collect data. What characterizes science? What is a scientific explanation? “Give me an explanation … ” A scientific explanation provides reasons for how a phenomenon occurs.
Scientific explanations are based on empirical evidence. Therefore, they can be tested.
Science cannot test explanations involving unsupported beliefs or opinions. Scientific explanations must explain all available evidence.
If new evidence is discovered, it is compared to the explanation.
If the explanation cannot explain the new evidence, the explanation may be modified. Scientists often start developing an explanation by examining all of the data and empirical evidence they have.
Then they think logically about the evidence and develop a reasonable explanation.
Other scientists test the explanation for themselves. What is a scientific explanation? First, study the empirical evidence. Decide if it supports the explanation.
Second, decide if the explanation is logical and agrees with your other observations.
Third, identify tests you can do to support the idea.
Finally, evaluate the explanation. How is a scientific explanation evaluated? (cc) photo by theaucitron on Flickr What is involved in scientific work? Common Habits Science and the people who study it are diverse. However, they have some characteristics in common.
When you show these characteristics, you are thinking like a scientist. Scientists make careful observations. They may use their senses or scientific tools to make observations.
Scientists are curious about the world and how it works.
Scientists are creative. They use their imaginations to come up with explanations, experiments, and solutions. Scientists are logical. They use evidence and careful reasoning to develop explanations.
Scientists are skeptical. They do not immediately accept claims. Instead, they ask questions and evaluate the claims.
Scientists are objective. They set aside their feelings and opinions when they evaluate ideas. How is pseudoscience similar to and different from science? “Space Aliens Built the Pyramids” Scientists are logical. They use evidence and careful reasoning to develop explanations.
Scientists are skeptical. They do not immediately accept claims. Instead, they ask questions and evaluate the claims.
Scientists are objective. They set aside their feelings and opinions when they evaluate ideas. What is involved in scientific work? Pseudoscience is beliefs or practices that are mistakenly believed to be based on scientific principles. Pseudoscience can look like science, but it is not science. science and pseudoscience can address topics from the natural world How is pseudoscience similar to and different from science? Pseudoscientific claims can sound logical. They may use technical language or scientific-sounding terms. science and pseudoscience claim to be supported by empirical evidence. science does use accepted scientific methods. Pseudoscience Science The evidence supporting pseudoscientific claims may be vague, biased, or inaccurate Pseudoscientific claims are often not testable. Pseudoscientists may say that any claim that has not been proven false must be true. This is faulty logic. Scientists offer evidence for their explanations. In contrast, pseudoscientists often ask skeptics to prove their claims false. Florida Benchmarks Unit 1 Lesson 2 Scientific Knowledge SC.8.N.1.3 Use phrases such as “results support” or “fail to support” in science, understanding that science does not offer conclusive ‘proof’ of a knowledge claim.
SC.8.N.1.5 Analyze the methods used to develop a scientific explanation as seen in different fields of science.
LA.18.104.22.168 The student will record information (e.g., observations, notes, lists, charts, legends) related to a topic, including visual aids to organize and record information, as appropriate, and attribute sources of information. Scientists plan their investigations to address a specific problem or question.
Their goal is to come up with a scientific explanation.
Each problem or question is unique and so requires a unique method and the proper tools. Method Acting How do scientists choose their methods? When choosing their methods, scientists rely on the tools available.
Scientists, however, know they don’t always have the tools they need.
Some tools may be too expensive, and others may not exist. Scientists also need to be creative in the ways they use their tools.
Tools are useful only if the scientists using them can interpret the data they provide.
This skill is a large part of the education of a scientist. Based on the subject under study, scientists may plan to do experiments or fieldwork.
When doing experiments, scientists control different variables under precise conditions in a laboratory.
Generally, physicists and chemists do a lot of experiments. In contrast, scientists doing fieldwork make observations of what is around them.
They watch, observe, and try to make sense of what they see.
Instead of controlling variables, they try to determine what variables are at work and how they relate to each other. A large part of doing fieldwork is coming to understand the variables that exist.
Biologists and geologists generally do a lot of fieldwork.
Sometimes, a scientist will do fieldwork and then take a specimen back to a laboratory to do more testing. Some theories are quickly accepted; others are not.
A good scientific theory is one that is supported by most of the evidence and can account for new observations as they arise.
Such a theory becomes widely accepted. Well, Prove It! How do scientific theories become accepted? At times, as new evidence is discovered, scientists may find that an earlier theory is incorrect or incomplete.
Good scientific theories often get modified but are rarely rejected. The most reliable scientific information is found in professional science journals, but it may not be easy to understand.
You should be cautious of accepting scientific explanations from advertisers or anyone trying to sell you something.
When you assess any scientific claim, ask yourself if it makes sense logically and whether the results support it. How can you know who’s right? Remember that science does not claim to prove anything.
Science attempts to provide an explanation that agrees with the results of observation and testing. The fossil Archaeopteryx gave the first solid evidence linking dinosaurs to modern birds.
Although it had wings and feathers and may have been able to fly, it seems it was more dinosaur than bird.
It had jaws with teeth, three-fingered claws, and a tail. A Theory for the Birds Dinosaurs take flight Florida Benchmarks Unit 1 Lesson 3 Scientific Investigations SC.8.N.1.1 Define a problem from the eighth grade curriculum using appropriate reference materials to support scientific understanding, plan and carry out scientific investigations of various types, such as systematic observations or experiments, identify variables, collect and organize data, interpret data in charts, tables, and graphics, analyze information, make predictions, and defend conclusions. SC.8.N.1.2 Design and conduct a study using repeated trials and replication. SC.8.N.1.6 Understand that scientific investigations involve the collection of relevant empirical evidence, the use of logical reasoning, and the application of imagination in devising hypotheses, predictions, explanations and models to make sense of the collected evidence. SC.8.N.1.5 Analyze the methods used to develop a scientific explanation as seen in different fields of science. SC.8.N.1.4 Explain how hypotheses are valuable if they lead to further investigations, even if they turn out not to be supported by the data. LA.22.214.171.124 The student will record information (e.g., observations, notes, lists, charts, legends) related to a topic, including visual aids to organize and record information and include a list of sources used.
Observation is the process of obtaining information by using the senses. Testing, Testing, 1, 2, 3 What are some parts that make up scientific investigations?
A model is a representation of an object or system. A testable idea or explanation that leads to scientific investigation is called a hypothesis.
The information from the investigation can help scientists form a better hypothesis.
An independent variable is the factor that is deliberately manipulated. Scientists investigate the natural world through experiments and observations. An experiment is an organized procedure to study something under controlled conditions. Scientific investigations may also involve the use of models. Hypotheses must be carefully constructed so they can be tested in a practical and meaningful way. A scientist may think of a hypothesis after making observations or after reading findings from other scientists’ investigations. If an investigation does not support a hypothesis, it is still useful. Scientists may go through many cycles of testing and analysis before they arrive at a hypothesis that is supported. A dependent variable changes as a result of manipulation of one or more independent variables. A variable is any factor that can change in a scientific investigation. Data are information gathered by observation or experimentation that can be used in calculating or reasoning. This information may be anything that a scientist perceives through the senses or detects using instruments. During their investigations, scientists record all their observations, setup, and procedures so that they will not forget anything. Scientists analyze data to determine the relationship between the independent and dependent variables in an investigation.
Then they draw conclusions about whether the data support the investigation’s hypothesis. What are some scientific methods? Many Methods Scientists do not always use the same steps or same order of steps in every investigation.
First, the scientist clearly and precisely defines the problem or question that needs to be answered. To test the hypothesis, the investigation must be carefully planned, taking into account the materials and equipment needed. They may even repeat some steps. Consider one possible path that a scientist might follow while conducting an experiment. Next, the scientist forms a hypothesis and makes predictions about what will happen in the investigation. The scientist must also decide how the independent variable will change and identify other variables that will be controlled. After the data are collected, the scientist may analyze them and draw conclusions about the results. The data collected in an investigation must be recorded and properly organized. The scientist must also determine how the results of the experiment will be measured. Life Lessons How are scientific methods used? Science is an ongoing process, as scientific investigations provide evidence that can either support or contradict a hypothesis.
A hypothesis can be replaced by a new or modified hypothesis after further investigation.
Thus, scientists are always prepared to modify their understandings of the natural world. Scientific methods are used in physical, life, and earth sciences.
Scientists carefully choose the setting for an investigation, such as the field or a laboratory.
Scientists may use models when studying things that are very large, small, or complex. Good scientific investigations share some important characteristics.
Scientific observations should be well documented and have supporting evidence.
In an experiment, the variables should be controlled as much as possible. High Quality What are some characteristics of good scientific investigations? Experiments should be repeated multiple times by the original investigator.
All scientific investigations should be replicated by scientists not involved with the original work.
Before publishing a study, scientific journals ask other scientists to review the article. This is called peer review. The most reliable scientific information is published in scientific journals, but it is often difficult to understand.
Reliable books are written by scientists and others who are knowledgeable about a particular field.
Reliable Internet sources are government and academic web pages. Commercial web pages are often unreliable because they are trying to sell something. How can you evaluate the quality of scientific information? Florida Benchmarks Unit 1 Lesson 4 Representing Data SC.8.N.1.5 Analyze the methods used to develop a scientific explanation as seen in different fields of science such as biology, geology, and physics.
SC.8.N.1.6 Understand that scientific investigations involve the collection of relevant empirical evidence, the use of logical reasoning, and the application of imagination in devising hypotheses, predictions, explanations and models to make sense of the collected evidence. SC.8.N.3.1 Select models useful in relating the results of their own investigations.
MA.6.A.3.6 Construct and analyze tables, graphs, and equations to describe linear functions and other simple relations using both common language and algebraic notation. LA.126.96.36.199 The student will record information (e.g., observations, notes, lists, charts, legends) related to a topic, including visual aids to organize and record information, as appropriate, and attribute sources of information. How do scientists make sense of data?
Modeling Data with Graphs
All of the different types of scientific investigations involve the collection of data.
Data are the facts, figures, and other evidence scientists gather when they conduct an investigation.
Scientists organize and record their data in data tables.
Data tables often have two columns.
One column lists the independent variable, which is the variable that is deliberately manipulated in an investigation.
The other column lists the dependent variable, which is the variable that changes as a result of manipulation of the independent variable.
Scientists often analyze data for patterns or trends by constructing graphs of the data.
The type of graph they construct depends upon the data they collected and what they want to show.
A scatter plot is a graph with points plotted to show a possible relationship between two sets of data.
In a scatter plot, the horizontal x-axis usually represents the independent variable.
The vertical y-axis usually represents the dependent variable.
To show the general relationship between the two variables, a “line of best fit” may be used. What do graphs show?
Scientists use different types of graphs to show different types of information about data.
A bar graph is used to display and compare data in a number of separate categories.
A circle graph is used to show how each group of data relates to all of the data.
Throw Me a Curve! What kinds of patterns can be shown using graphs?
When you graph data, you can identify what the pattern, or trend, of the data is.
A trend shows the relationship between the two variables studied in the experiment.
Graphs make it easy to tell if something is increasing, decreasing, or staying the same.
In some cases, a line can be used to show the trend of data on a graph.
If the relationship between the independent and dependent variables can be shown with a straight line, the graph is called a linear graph.
A straight line shows that the rate of change of the dependent variable with respect to the independent variable is constant.
The density of water as a function of temperature is a linear relationship.
A graph in which the relationship between the variables cannot be shown with a straight line is called a nonlinear graph.
If the product of variables remains constant, the variables are said to have an inverse relationship.
A graph of an inverse relationship is a smooth curve that becomes nearly vertical and horizontal at opposite ends.
The relationship between volume and pressure for a gas at a constant temperature is a nonlinear relationship. How do scientists select models? The Perfect Model Scientists use many different kinds of models.
Some are physical models, such as maps and globes.
Others are mathematical models, including equations and simulations of movement.
A model is a representation of an object or a process that allows scientists to study something in greater detail.
A model that is too simple or too complicated may not be useful.
The best models are those that most closely resemble the system, process, or other entity they represent.
Scientists select models based on how much the models can explain.
In addition, scientists select models based on how few limitations they have.
Today, many phenomena in science can be modeled with great sophistication.
Unit 1 Lesson 5 Science and Society
SC.8.N.4.1 Explain that science is one of the processes that can be used to inform decision making at the community, state, national, and international levels.
SC.8.N.4.2 Explain how political, social, and economic concerns can affect science, and vice versa.
In what areas does science help us make decisions?
Water, water everywhere!
Science has led to lifesaving discoveries and has taught us to protect our resources, too.
Decision-makers use scientific information to help them make laws.
Rules and laws may be enforced by government agencies on the community, state, and national levels.
Some decisions affect more than one country and have to be made on the international level.
In this case, nations adhere to agreed-upon rules.
Science gives a country’s representatives the data they need to talk about and make decisions about these types of matters.
How can science and politics affect each other?
The direction of science is affected by many things, including political, societal, and economic concerns.
Science, in turn, affects politics, society, and the economy.
At times, politics or government leaders set a direction or goal for science.
Political support can increase funding for scientists studying certain areas.
Political support can also encourage scientists to work together.
Some people question the value of certain scientific projects.
These people argue that our resources should be spent on solving more urgent problems.
Others point out that even these scientific projects have benefited humanity.
How do science, society, and economics interact?
Big Help! Science is influenced by societal needs and economics.
If society sees no value in certain research, scientists may not get funding for the research.
People may not buy or use new technologies if they do not think they are useful.
Scientists look for ways to meet the needs of society.
As scientists explore new things, they gain new knowledge that may improve upon or even challenge existing knowledge.
How did scientific advances reduce polio rates? How did that affect the U.S. economy?
Science and economics affect each other.
Science can be expensive, and priorities must be set on how to spend money on science.
Conversely, science makes improvements that allow people to live longer, make more money, and put more money back into the economy.
By: Melanie M. The End