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# 1 - PHYS2001 Physics 1 1.1 The Nature of Physics From the...

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PHYS2001 Physics 1 1.1 The Nature of Physics From the very big to the very small, Physics covers it all! This semester we will focus on Classical Mechanics big things moving slowly (wrt the speed of light). Next semester you will study Electricity and Magnetism and Quantum Mechanics . Physics is the most fundamental of all the natural sciences. In science, there is only physics. All the rest is stamp collecting. - Earnest Rutherford The strength of Physics as a science is that all of the physical laws are based on experimental results. So why should you be required to take Physics ???

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Physics is like sex. It has practical applications, but that is not the main reason you do it. - Richard Feynman Our goal is to describe and explain how and why the world works the way it does. Through this process you will become analytical thinkers and effective problem solvers. Physics is the perfect vehicle for doing this. These are the skills you should take with you when you leave this course the skills you should take with you when you leave this course. What do we get with this knowledge??? Lasers Rockets Transistors Telecommunications Etc All technology has its roots in Physics ! Etc. 1.2 Units Accurate measurements require precisely defined quantitative units Accurate measurements require precisely defined quantitative units. We are going to want to measure things like length , mass , and time .
There are several different systems of units used for measurement: SI System International or MKS units (meter kilogram second) SI System International or MKS units (m eter, k ilogram, s econd) CGS (c entimeter, g ram, s econd) BE British Engineering units (ft slug second) BE British Engineering units (ft, slug, second) In this course we will use SI (MKS) units. Length = Meter (m) = Distance light travels in a vacuum in 3.3 ns (3.3 × 10 -9 s) Mass = Kilogram (kg) (1 kg Ł 2.2 lbs. on the Earth s surface) Time = Second (s) = The time it takes for 9,192,631,770 vibrations of a Cs-133 atom to occur 1.3 Converting Between Different Units and Base Units 1 km = 1000 m = 1 × 10 3 m 5.2 cm = 0.052 m = 5.2 × 10 -2 m If you need to brush up on powers of 10 or scientific notation, see Appendix A.

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To Do Unit Conversions: T t th it l b i titi - Treat the units as algebraic quantities - Multiply by factors of 1 - Use the mol method Example My cat, Socola, is fat. He has a 17 in. waist. What is Socola s waist size in m? 17 in. 1 in. 2.54 cm 1 m 100 cm = (17)(2.54) 100 = 0.43 m All of your answers must have appropriate units!!!
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1 - PHYS2001 Physics 1 1.1 The Nature of Physics From the...

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