Science Physics Reviewer, Lecture notes of Physics

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|. What is Physics? * Physics is a natural science that deals with the understanding of nonliving things. It deals specifically with matter and energy and their relationship * It was two main branches: classical physics (ie. mechanics, optics, etc.) and modern physics (quantum physics, etc.) Fundamental vs. Derived Quantities * Fundamental quantities are basic concepts that they are difficult to define. They can only be represented by one form. of measurement. o Ex. distance, time, mass « Derived quantities are those that may be represented by two quantities. ‘ displacement o Ex. velocity = ———_—_———_ time Accuracy vs. Precision e Accuracy of measurement describes how well data agree with the accepted of a quantity being measured (how close to the actual). e Precision refers to how exactly can a measurement be reproduced (how close the data are to each other). o Ex. accepted value = 334 K accurate precise, neither and but not accurate precise accurate nor precise Trial 1 333 K 200 K 300 K Trial 2 335 K 201K 250 K Trial 3 334 K 203 K 350 K REVIEW: Scientific Notation, Conversion of Units ll. Scalars and Vectors Identifying Scalars and Vectors e Ascalar quantity is described by magnitude o Examples = 40kg * 35 minutes = 800K e A vector quantity is described by both magnitude and direction o Examples = 80 kphE = 20 .N upward Vector Representation « Avector quantity is represented by an arrow o The orientation of the arrowhead indicates direction