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# The Methods Of Science

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Scientific Method, si measurement

Scientific Method, si measurement

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• Cool! You helped me cuz I forgot my textbook and my notebook at my locker! And I have homework. Due monday. Today's Saturday, so i can't go back! But, Science is after lunch (Thank StarClan and the ice, tree, and water sprits. Don't forget Earth-Dog!) (Huge Warrior Cats, Seekers, and Survivers fan) so i can do it then.

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### Transcript

• 1. The Methods of Science
• Science: method for studying the natural world
• Life, Earth, Physical science
• Explains the natural world
• Scientists learn by investigation  observation, experimentation, or modeling
• 2. Scientific Method
• State a problem
• Gather information
• Form a hypothesis
• A possible explanation
• Test the hypothesis
• 3. Testing a Hypothesis
• Experiments with variables
• Dependant variable changes values as other variables change
• Independent variable is changed to determine how it will affect the dependent variable
• A variable that does not change when other variables change is a constant
• A control is the standard to which test results are compared
• 4.
• Analyze data from experiment or investigation
• Form a conclusion based on the data
• Reduce bias by
• keeping accurate records
• Repeating the experiment
• Using data that is measurable
• 5. Standards of Measurement
• Standard
• Exact quantity that people agree to use for comparison
• Measurements must be taken carefully
• Precise: how closely measurements are to each other
• Accurate: how closely measurement is to real or accepted value
• 6. International System of Units: SI
• Based on the metric system  multiples of 10
• Used by scientists worldwide
• 7.
• Distance
• Measure distance between 2 points
• SI unit of measure is the
• Meter: about a baseball bat in length
• Volume
• Amount of space occupied by an object
• 1 L= 1 dm 3 = 10 cm 3 = 1000 ml
• 8.
• Mass
• A measurement of the quantity of matter in an object
• Density is a combination of units  derived unit
• Mass/volume
• Aluminum vs. iron
• 9.
• Time
• Interval between 2 events
• SI unit  seconds
• Temperature
• Measure of how hot or cold something is
• SI unit is Kelvin  K
• 0 K is the coldest possible temperature
• -273 ºC = 0 K
• 10. Communicating with Graphs
• Visual display of information or data
• Used to detect patterns
• Line graph
• Shows a relationship where the dependent variable changes due to a change in the independent variable
• x axis = independent variable
• y axis = dependent variable
• 11.
• Bar graph compares information collected by counting
• Each bar represents a quantity counted at a particular time
• Circle graph shows how a whole is broken into parts
• The parts represent percentages of the whole
• 12.
• 13.