Physics Basics Summary Notes Science Significance of Science What is Physics Technology
Weiner, David, Film and Features Critic has reference to this Academic Journal, PHwiki organized this Journal Physics Basics Summary Notes Science The study in addition to pursuit of knowledge about the natural world. Example A physicist tries to underst in addition to how the Sun gives us light. Significance of Science The search as long as knowledge adds to our underst in addition to ing of the physical world. Scientists want to know! Science affects society by stimulating thought satisfying curiosity influencing views of the world providing knowledge necessary as long as new technological advances
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What is Physics The study of motion, as long as ces in addition to energy. The entire universe is built upon of the principles revealed by a study of physics. -Andrew Zimmerman Jones Technology The application of science to meet human needs. Example Designing in addition to building solar panels as long as alternative energy automobiles Significance of Technology Put the findings of science to use Try to solve practical problems New technology often leads to new discoveries in addition to the advancement of science
Examples of Technologies that led to the Advancement of Science Telescope used to discover new planets, moons in addition to stars Microscope used to discover microorganisms that cause disease, such as bubonic plague Internet in addition to computer processing a huge amount of data in a matter of seconds The Branches in addition to Disciplines of Science Natural Science Physical Science Life Science Earth/Space Science 1. Physics 2. Chemistry 1. Biology 2. Zoology 3. Botany 1. Geology Meteorology Astronomy The branches of science are separate, yet integrated. Life Science Physical Science Earth in addition to Space Science
Significance of Physics Foundation as long as other sciences. Everything around us is affected by it. Explains phenomena such as orbiting satellites, weightlessness, lightning, sonic booms, magnetism in addition to energy trans as long as mations. Scientific Theory A synthesis of a large body of in as long as mation that is well-tested in addition to verified in addition to explains about aspects of the natural world. Examples Atomic theory explains the atom Plate Tectonics explains the as long as mation of volcanoes, earthquakes in addition to mountains Significance of a Scientific Theory It has been extensively tested through scientific investigation in addition to never disproven It grows slowly through contributions from many investigators. Can be replaced if new evidence is discovered
Scientific Law or Principle A summarizing statement about the relationship of natural quantities. A scientific fact Example F = ma is Newtons 2nd Law of Motion Law of gravity Objects are gravitationally attracted to other objects (its a fact) Significance of a Law A law demonstrates in addition to summarizes, does not try to explain Sometimes is represented by an equation vs. Newtons Theory of Motion F = ma Newtons 2nd Law of Motion explanation Scientific Hypothesis An educated guess that can be tested. Example If the mass on a cart is increased, then the carts rate of acceleration will decrease given the same as long as ce.
Significance of a Scientific Hypothesis Drives the scientific process Has not been proved Can be adjusted in addition to retested depending on the outcome of the first test SCIENTIFIC MODEL A representation of an object or event that can be studied so that the real object or event can be understood. Examples: A globe Computer models as long as hurricanes Significance of Models A model can be tested by comparing its predictions to actual observations in the real world. Can use scientific method by changing one variable to see how it affects the other variable(s). A close match does not necessarily mean that the model is the only true model or the only one that would work.
Theory vs law/hypothesis/model Theory is an explanation that has been proved through testing Law is a summary (often expressed as an equation) Hypothesis is an question or educated guess that can be tested (but has not been tested) A model is a representation of something that can be used to study it. Fact: something that is observed to be real Scientific Theory: A explanation of an occurrence or phenomenon in the natural world. Supported by evidence Accepted as valid Accurate at predicting in addition to testing Scientific Laws: Factual observations expressing a fundamental principle of science. Model: A representation of an object or event that can be studied so that the real object or event can be understood. Hypothesis: a possible answer to a question; an educated guess that has not been tested.
Variables Anything in an experiment that can change. Identifying Variables in a Scientific Hypothesis If the mass on a cart is increased, then the carts rate of acceleration will decrease given the same as long as ce. The three variables are underlined. Independent variable (experimenter changes to see how it changes the dependent variable Constant (experimenter keeps this the same) Dependent variable (changes depends on the influence of the independent variable The if statement shows independent variable, the then statement shows the dependent variable. Experimental control : a test without using the independent variable, use to see if the independent variable makes a difference MEASUREMENTS Measurements consist of a number in addition to a unit. Example 100 meters the number of units the unit
INTERNATIONAL SYSTEM OF UNITS (SI units) Developed as long as the sake of consistency ease of underst in addition to ing sharing data BASE SI UNITS (st in addition to ard units) Measured quantity DERIVED UNITS Derived Units: Combinations of the 7 base units. Examples Area (length x width) m x m = m2 Velocity (distance/time) = m/s 10 meters 5 meters 50 m2
ACCURACY Accuracy is the extent to which a measurement approaches the true value. Your Time: 2:05 pm Actual Time: 2:10 pm Your accuracy is off by 5 minutes – The bulls eye represents the true value. – The darts represent three separate measurements accurate less accurate these darts show good accuracy which paint ball mark is more accurate PRECISION Precision is the degree of exactness of a measurement. Based on the scale of the measuring instrument. Smallest tick marks represent millimeters (mm)
PRECISION VS. ACCURACY AGood precision in addition to accuracy BSome accuracy in addition to poor precision CGood precision in addition to poor accuracy DPoor precision in addition to accuracy A B C D
Weiner, David Film and Features Critic
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