chapter 1 science&technology. science: (and technology) science - knowledge attained through...
TRANSCRIPT
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Chapter 1
Science&
Technology
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Science: (and technology)
•Science - knowledge attained through study or practice or knowledge covering general truths of the operation of general laws, especially as obtained and tested through the scientific method [and] concerned with the physical world•Technology - and knowledge of tools, techniques, and crafts.
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Science: (and technology)
•Has helped societies throughout history to advance and even thrive above other cultures.
•organized way of investigating the natural world and put resources to a beneficial use.
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3 Examples Weapons = to protect the people and gain
new land & resources Agriculture = to feed the people which help
prevent civil unrest Medicine = to cure and prevent diseases so
the people may live longer
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Laws and Theories
Theories: explanation based on observations and investigations. Theories can change or be discarded if new information is discovered
Developed from a hypothesis that is proven over and over
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Laws and Theories
Scientific Law: Statement about things that occur in nature and seem to be true all of the time, do not explain why or how
Law of gravity – two masses attract each other
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Scientific Method: a logical method to solve ANY
problem.
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Scientific Method
State the Problem = needs to be well defined
Gather information = (Research the Problem) become an expert on the problem
Form the Hypothesis = through research; an educated guess at a solution to the problem
Test = run a controlled experiment to test the hypothesis by Recording & analyzing data
State Your Conclusion = evaluate the success of the hypothesis. Adjust and Retest as necessary
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Research and Hypothesis
Research – gather information about past observations and experiments so that experiments and errors are not repeated
Hypothesis – an educated guess that is testable
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Testing the HypothesisFollows a procedureTrials = number of times the experiment
was run. Needs to be a high number to add credibility to the work
Variables = conditions that change during the experiment & factors being tested– independant variable = condition(s) you change – dependent variable = condition(s) that is changed
as a RESULT of what you did *On a Graph = dependant variable goes on the y-
axis, independent variable on the x-axis
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Specimen Groups
Control Group = a group that had NO changes in their conditions. Used to set what is NORMAL in order to make comparisons
Experimental Group = group(s) that have the experimental change (independant variable)
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Data
Record and analyze dataCarefully review all of the data you
have collected from your experiment.
Use charts and graphs to help you analyze the data and patterns.
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Conclusions
Communicate your results– Explain whether the data supports your
hypothesis – Acknowledge any deviations from what you
expected – Derive conclusions, based on your findings– Relate your findings to earlier work in the
same area (if you can) – Explore the implications of your findings
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90 mice are run through a maze to get
the average for that maze.
5 minuteswas the
average (all 90 mice)
30 miceControl Group
NO MUSIC
30 miceExperiment Group
ROCK MUSIC
30 miceExperimental Group
CLASSICALMUSIC
Music, Mice and a Maze
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Questions
Name the variables.What time MUST the control group have
in order to declare any results as valid?Why must all 3 groups get the exact
amount of food & water?What is the purpose of the maze?What are your predictions?
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Actual Results
0
5
10
15
20
25
30
TIME (in minutes, mins.)
ControlGroupExperimental(Classical)
Experimental(Rock)
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Prediction and Inference
Statement about the way things will happen in the future, often but not always based on experience or knowledge.
process of drawing a conclusion by applying logic and facts to observations or hypotheses
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Models
Representation of an idea, event or object to help people better understand it
Can be physical or computer simulations
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Measurement
Standards of MeasurementsAccurate measurements are needed
to make an experiment valid. Standards are exact quantities
(amounts) that people agree upon for comparison.
Measurement is represented by a number and a unit.
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Measurement Systems2 types
1. English system of measurement– a. Volume (gallon)– b. Mass (pound)– c. Length (foot)
2. Metric System (International System of Units)– Base Units
Volume (liter)Mass (gram)Length (meters)Time (seconds)Temperature (Kelvin)
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SI units
The SI Units are used by scientists and all but 2 countries in the world. The units have prefixes that are used to represent what multiple of ten is being used.
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Kangaroos hopping down backwards drinking chocolate milk!
Kilo- 1000 Hecta- 100 Deca- 10 Base Unit- 1 Deci- 1/10 Centi- 1/100 Milli- 1/1000
Multiples of ten are used so that conversions are easily made between each unit.
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Conversions
Going up the stairs – move decimal to left for every stair you move
Going down the stairs – move decimal to the right for every stair you move
20 dag = ______ mg3 m = ______ cm1500 mL = ______hL2.8 km = ______dm
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Measuring Distance
Length is the distance between two points. You have to choose a unit to measure in that will be most appropriate.
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Measuring Volume
Volume is the amount of space that is occupied by an object.
Volume of a rectangle= Length x Width x Height
Unit would be the unit³ Example: cm³
How do you measure the volume of a liquid? You have to measure the capacity of the container.
1 cm³ = 1 mL
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Measuring Matter
Mass is the measurement of the quantity of matter in an object. Matter takes up space.
Density is the mass per unit volume of a material
Density = Mass Volume
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Measuring Time and Temperature
Time is the interval between two events measured in seconds.
Temperature is measured in Kelvin (K).
Freezing point of Water is 0ºCBoiling point of water is 100ºC0.0K is the coldest possible (known
as absolute zero)Water freezes at 273K and boils at
373K.
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Communicating with Graphs
A graph is a visual display of information or data.
Types: 1. Line – Shows the relationship
between independent and dependent variable
x-axis= (horizontal) independent variable
y-axis= (vertical) dependent variable
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Line Graph
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Bar– useful to show comparisons or
numerical dataA word or category or a number
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Circle– Fixed quantity is broken down into
parts- Percentages
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Scientific Notation*from standard notation to
scientific notation1. Write # between 1 and 102. Write (x10)3. Count number of spaces the
decimal moved and write it as an exponent on the ten
4. Positive exponent if moved left (making the entire number smaller)
5. negative exponent if moved right (making the entire number larger)
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*From Scientific Notation to Standard
1) For positive exponent move decimal number of spaces to make the number bigger
2) For negative exponent move decimal number of spaces to make number smaller