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1

Inertial Reference Frame

A reference frame where Newtonâ€™s First Law is valid, can move at aconstant velocity

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2

Relativity Principle

The basic laws of physics are the same in all inertial reference frames

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3

Absolute

Describes measurements that do not change from one reference frame to the next, includesspace and time

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4

Ether

he assumed medium light travels through in space, the velocity of light given by Maxwellâ€™s Equations was assumed to be respect to this ether

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5

Null Result

The failure to detect a difference in the speed of light when it travels in different directions relative to the ether

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6

First Postulate

The laws of physics have the same form in all inertial frames

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7

Second Postulate

Light propogates through empty space with a definite speed, c, independent of the speed of the source or observer

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8

Thought Experiments

Simple experimental situations which can be thought about and used tosee the consequences of relativity theory

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9

Event

Something that happens at a particular place at a particular time

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10

Time Dilation

Clocks moving relative to an observer are measured to run more slowly, as compared to clocks at rest

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11

Length Contraction

The length of an object relative to an observer is measure to be shorter alongits direction of motion than when it is at rest

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12

Four-Dimensional Space-Time

The idea that space takes up three dimensions and time is the fourth dimension

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13

Space-time interval

The quantity of four-dimensional space-time between two events

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14

Relativistic Mass

The mass of an object with reference to its velocity

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15

Correspondence Principle

The insistence that a more general theory can give the same results asa more restricted one

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