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Special Theory of Relativity-1905 (high speed motion): Albert Einstein (1880-1955) Special Theory of Relativity-1905 (high speed motion): Postulates (hypotheses) for all inertial observers: inertial observer —anyone for whom the pendulum hangs down. The laws of physics are the same (when there is no accelerated motion). 2. Speed of light, c, in a vacuum is the same. Extraordinary Consequences: 1. Objects contract in the direction of motion. 2. Time slows for a clock moving near c. 3. No object can move faster than c. 4. Mass increases as the speed of light is approached. 5. Mass may be converted into energy and vice versa by E = mc2. Fission, fusion, and antimatter conversion. (E = energy, m = mass, c = speed of light = 3 x 108 m/s.)

First Postulate: All inertial observers will deduce the same laws of physics.

Second Postulate: The speed of light in a vacuum is the same for all observers.

Extraordinary Consequences: Near light speed, we see objects contract in the direction of motion—Lorentz contraction

Extraordinary consequences: 2. Time slows for a clock moving near c --time dilation.

Extraordinary consequences: 3. No object can move faster than c. For objects with mass, there is a speed limit in the universe.

Extraordinary Consequences: 4. Mass increases as the speed of light is approached. Particle Accelerator at CERN

Extraordinary consequences: 5. Mass may be converted into energy and vice versa by E = mc2. Fission, fusion, and antimatter conversion. (E = energy, m = mass, c = speed of light = 3 x 108 m/s.)