IB PHYSICS Option A: Relativity

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Reference frame

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7 Terms

1

Reference frame

A system that defines an object's position using coordinates and time events, providing a perspective for observation.

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2

Inertial frames of reference

Frames that are non-accelerating and move at constant velocity relative to each other, with no absolute stationary frame in the Universe.

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3

Galilean Relativity

The principle that objects in inertial frames move in straight lines with constant velocity unless acted upon by force, corresponding to Newton's first law.

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4

Cartesian coordinate system

A system commonly used for reference frames, representing points in space in 3D and 2D.

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5

Lorentz transformations

Equations that establish the connection between values in different reference frames, superseding Galilean transformations when dealing with speeds close to that of light.

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6

Einstein’s Two Postulates of Relativity

First, the laws of physics are the same in all inertial frames; second, the speed of light in vacuum is constant in all inertial frames.

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7

Simultaneity in Special Relativity

The concept that events being simultaneous depends on the observer's reference frame, contrasting with Galilean relativity where simultaneity was absolute.

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