PHYS 1010 Week 1 Notes
PHYS 1010 Week 1 Notes PHYS 1010-01
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This 2 page Class Notes was uploaded by HaleyG on Friday January 15, 2016. The Class Notes belongs to PHYS 1010-01 at Tulane University taught by Timothy Schuler in Fall 2016. Since its upload, it has received 91 views. For similar materials see Great Ideas in Science & Tech in Physics 2 at Tulane University.
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Date Created: 01/15/16
PHYS 1010 Notes Week 1 Jan 1115 Scientific Method Prediction, testing, and revision Formally identify problem Hypothesis is generated as a solution Hypothesis is used to predict results of an experiment Experiment is controlled so there are no false positives Repeated experiments verify or nullify the hypothesis Hypothesis is revised and prediction and testing is repeated Refining a hypothesis leads to a simpler overall theory "Code of ethics" to ensure the results are true Scientists must publish the results and details for peer review Theory: a welltested group of hypotheses from a large body of information It is impossible to completely prove a theory/test every possible situation Repeatedly verified theories sometimes are called laws Laws are considered the foundations of the theories within a field Theories change over time Bottomup method: science starts with evidence and facts and builds on those to create eventual theories Scientific Terms Each physical quantity has a "unit" to use Physics uses the metric system, defined by a system called SI SI has seven fundamental units: length meter; time second; mass kilogram; temperature kelvin; amount mole; electric current ampere; light candela Units used for other quantities are defined in relation to these base units and are "derived" from these units Length Meter (m) Originally defined as one tenmillionth of the distance from the equator to the North Pole Now defined as the distance light travels in 1/2,99,792,458 seconds The US unit is yard (yd), which is 0.9144 meters Time Second (s) Defined as the time it takes for a specific amount of vibrations of Cesium133 atoms to occur US unit is the same as the SI unit Mass Kilogram (kg) Defined as 1/12 the mass of a Carbon12 atom US doesn't have a unit of mass, uses force instead in pounds (lbs) Scientific Notation Describes extremely large or small numbers Shortens the length of written numbers by expressing nonsignificant digits as powers of ten SI system uses stander prefixes to denote the power ten associated with a measurement in scientific notation Correct scientific notation contains a number between 1.0 and 9.9 multiplied by a power of ten Significant figures Significant figures show the precision of a measurement The number of significant figures in a measurement must be taken into account when performing math
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