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## Physics 2001 Lecture 1 Notes - Sections 1.1-1,4

by: Caroline Spohn

158

18

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# Physics 2001 Lecture 1 Notes - Sections 1.1-1,4 PHYS 2001

Marketplace > Louisiana State University > Physics > PHYS 2001 > Physics 2001 Lecture 1 Notes Sections 1 1 1 4
Caroline Spohn
LSU
GPA 3.7

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These notes encompass the first four sections of chapter 1 and include the topics The Nature of Physics, Units, the Role of Units in Problem Solving, and Trigonometry.
COURSE
General Physics
PROF.
Dr. Mesa
TYPE
Class Notes
PAGES
2
WORDS
CONCEPTS
Physics, Trigonometry, converting units, dimensional analysis
KARMA
Free

## Popular in Physics

This 2 page Class Notes was uploaded by Caroline Spohn on Monday August 22, 2016. The Class Notes belongs to PHYS 2001 at Louisiana State University taught by Dr. Mesa in Fall 2016. Since its upload, it has received 158 views. For similar materials see General Physics in Physics at Louisiana State University.

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Date Created: 08/22/16
PHYSICS 2001 LECTURE 1 NOTES – EXAM 1 Monday, August 22nd Syllabus Day & Sections 1.1-1.4 Section 1.1 – The Nature of Physics - Physics helps to explain how and why the world works as it does - Used to predict outcomes from experimental data - All technology is based in physics o Lasers o Rockets o Transistors o Telecommunication o Etc. Section 1.2 – Units - Units are required for accuracy - Length: Meter o Originally the standard was the distance between 2 marks on a bar of platinum, iridium alloy; the distance measured along the earth’s surface between the north pole and the equator. o Now based on the distance that light travels in a time of 1/229792458 seconds (229,792,458 m/s = speed of light or c) - Mass: Kilogram o Standard based on a cylinder of platinum -iridium o Definition has changed over time; the mass of an object indicates the tendency of the object to continue in motion with a constant velocity. - Time: Second o Originally based on the average time the earth took to com pletely rotate on its axis (86,400) <- know this number o Atomic clock used to keep standard time – runs from electromagnetic waves emitted from cesium - 133 atom; One second is defined as the time needed for 9 1 92 631 770 wave cycles to occur - These “base SI units” are used in combination to create other variables for quantities like force and energy or “derived units” Section 1.3 – The Role of Units in Problem Solving - Because measurements can be e xpressed in a number of ways, conversion factors are important to know to transition from one unit to another o 1 ft = 0.3048 m o 1 mi = 1.609 km o 1 hp = 746 W -3 3 o 1 liter = 10 m - Strategy: o Write down every unit explicitly o Treat units as algebraic quan tities; units divided by themselves disappear, multiplied, they are squared o Use the conversion factors given - Dimensional Analysis o Dimension - the physical nature of a quantity and the type of unit used to specify it o Dimensional analysis is a tool to check the accuracy of a conversion and the mathematical relations between quantities o Essentially after all the common units are crossed out or mul tiplied, are both sides ezuivalent? Section 1.4 – Trigonometry - Sin, cos, and tan are numbers without units because they are merely ratios - Inverse Trigonometric Functions are equations in which the sides of a triangle are given and the angle, Θ, is unknown; these functions are referred to as arc sin, arc cos, arc tan - Pythagorean Theorem – the equation that represents the relationship between the 3 sides of a triangle o a + b = c 2 2

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