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Physics is the study of the underlying structure of our universe—energy, matter, space, and time. Physics stretches from the vastness of the cosmos to the minuteness of the quantum world inside the particles that make up atoms. It contemplates the remote past at the very beginning of time, all the way forward to the indefinite future when space and time collapse back into the primordial realm whence they came. Oh, and it helps us blow stuff up, too.
The study of physics came into its own when Sir Isaac Newton (1643-1727) published his Principia, laying out the ground rules for the way objects behave in the presence or absence of forces. It was Newton who told us that “objects in motion tend to remain in motion unless acted upon by an outside force,” and he developed the law of gravity (though not, as commonly thought, when an apple hit him on the head). Newton’s laws became known as Classical Mechanics and stood for more than two centuries as the uncontested explanation for how the universe worked. In fact, around 1900, a physics professor told his young student not to bother becoming a physicist because everything that could be known already was!
Then in the 20th century Max Planck discovered the world of quantum mechanics and Einstein ignited the world of physics with his discovery of relativity. Beginning in 1905, Einstein postulated special relativity:
1. The speed of light is the same for all observers, no matter what their relative speeds.
2. The laws of physics are the same in any inertial (that is, non-accelerated) frame of reference. This means that the laws of physics observed by a hypothetical observer traveling with a relativistic particle must be the same as those observed by an observer who is stationary in the laboratory. [1]
Einstein then gave us the most famous theory ever written, e=mc2, which means that energy is equal to mass times the speed of light squared. In other words, energy and mass could be converted into one another.
These important discoveries radically revised the way we look at physics, from the very small (quantum) to the very large (relativity). The task of the 21st century has been developing a way to harmonize relativity and quantum mechanics into a “theory of everything” that really would explain the whole universe, past, present, and future. The conjecture that has come closest so far is string theory, which holds that all matter is made up of tiny vibrating strings made from a number of hidden dimensions beyond those of the “normal” universe (length, width, depth, and time).
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[1] “Theory: Special Relativity,” Stanford University, 5 May 2003, <http://www2.slac.stanford.edu/vvc/theory/relativity.html> (19 September 19, 2006).
