Models
can models change?
Yes! a model must be workable
what is a systematic study of the universe to produce observations, inferences and models
science
what is the central activity in science
observation
what is the difference between quantitative and qualitative data
quantitative looks at the quantity (amount) qualitative looks at the descriptions
what is a benefit to using the SI system?
it is a decimal system, so it is easy to convert between units
What are the three kinds of models
Physical, conceptual, mathematical
what are the assumptions we have about the world that affect every decision we make?
worldview
what comes first, posing a question or researching?
posing a question (gives purpose to the research)
an expert determines the volume of a liquid to be 32.0mL, while the accepted value is 35.0mL. what is the percent error?
8.57%
8.6%
what SI unit measures temperature
Kelvin
what is a type of model that explains a related set of phenomena
Theory
a system of moral values or a theory of proper conduct
ethics (deontological, teleological, existential)
what is the catch phrase for conclusion?
support or refute the hypothesis
if you measure a string to be just over 25cm, which answer is more precise 25.21 or 25.2, why?
25.21 (because it shows the estimated digit (1) to the 100ths place.
what is the difference between a formula unit and a derived unit
formula unit measures one thing (gram, kilometer, liter)
derived unit combines two or more base units (km/h or m/s)
what are the two criteria that a model must fit to be considered workable?
explain/describe something well and must make accurate predictions
the degree of exactness of a measurement
precision
what is peer review
before publishing his findings, a scientists will have other scientists review and respond to research
Convert 7.1km to cm
710,000cm
what SI prefix is measured as 10-3
prefix milli
what model is an initial testable explanation of a phenomenon that guides an investigation
Hypothesis
nature acts predictable; the same today, tomorrow, and forever
principle of uniformity
what are the 8 steps to the scientific method?
Observation
posing questions
research
form hypothesis
investigation
analysis
conclusion
communication
convert 54km/h to m/s
15m/s
Can you convert from km straight to cm?
no you have to convert from km > m (base unit) > cm