Physics 101- Introduction to Mechanics

In this course we will study how the universe works.  Okay, I know that sounds like a grand plan; but, trust me, it is an accurate description of physics.  Not only will we learn how large systems (the moon orbiting about the earth, for example) behave, but the same principles also govern how everyday objects such as baseballs and rockets move.  It's this universality of classical mechanics that is so amazing.  In fact, this idea of having a single concept (or just a few) describe many different systems is at the core of physics.
Physicists (and other scientists) search for fundamental principles.  When a physicist (or physics student!) sees a problem they first ask themselves "what are the fundamental principles at work here?"  I'm not going to claim that this is an easy thing to do.  Many systems are very complicated and it takes some time determine what is going on.  One must stay focused on the task of sorting out the fundamentals from the extraneous information.
Why do we study classical mechanics first?  Why not jump into the physics of blackholes or quantum computers?  Classical mechanics is valid for an amazing number of systems; admittedly, we do have to modify it to accurately describe extremely large objects (general relativity), very fast moving objects (special relativity) or small objects (quantum mechanics).  You can almost play "six degrees of separation" with classical mechanics- every field of physics is, in some way, an offshoot of classical mechanics.  In order to understand how your computerís processor functions you need to learn about condensed matter physics (the physics of solids and liquids) which is based upon quantum mechanics and thermodynamics (the physics of heat and energy).  And, guess what?  Those are directly related to classical mechanics.
Below I've sketched a "concept map" that shows some of the connections between various areas of physics.  It is by no means complete; if it were, there would be many more connections.  For example, one relatively new field of study is sonoluminescence where one can produce light from sound pulses.   Also, chaos theory has been connected to nearly every area of physics (and many non-physics fields such as economics).  If one wanted, you could even extend the map to connect with the other science and engineering fields.- e.g. condensed matter physics is intimately related to physical chemistry.

Okay, so whatís the message to get from this?  The classical mechanics that we will study this semester can be thought of as the foundation of all areas of physics as well as most of the other science and engineering fields.  We are truly about to begin our quest to figure out how the universe works.
One small warning to go with the sales pitch: Physics can be rather mathematical and abstract.  We will try to focus on real-world examples and discuss them in everyday language as much as possible.  However,... We will be solving problems with mathematics; after all, equations can be a very compact and convenient way of expressing a concept.  But, you shouldnít think of the equations and math as physics.  The equations may at first make you feel as though youíre learning a foreign language.  But, math is just that, the language of physics; mathematics is not the same as physics.  The concepts we will discuss (and experiments that illustrate them) are the heart and soul of physics; mathematics is simply a tool.
One last part of this section- how the course will be taught.  The class will be taught in a "student-centered" style using various strategies designed to promote active engagement with the material.  Most of our class time will be spent asking and answering questions, doing demonstrations, and participating in group activities.  This design is not based on a whim, rather it stems from years of educational research by some rather smart people.

 Tellme, I'll listen. Show me, I'll believe. Involve me, I'll learn.                 Native American Proverb I hear and I forget. I see and I remember. I do and I understand.                      Chinese Proverb

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 Jeff Phillips phillips@lmu.edu Loyola Marymount University Spring 2002