An
inertial frame refers to a reference frame where an object remains at rest or moves with a constant velocity unless acted upon by an external force. It is a frame of reference that follows the laws of physics without any additional acceleration or forces. This means that in an
inertial frame, objects will continue to move in a straight line or remain at rest unless influenced by an outside force.
Full definition
Physicists say that you are in the
same inertial frame as the train, meaning that you're moving with it and your walking or jumping is relative to it.
Einstein was interested in the invariance of the speed of light
wrt inertial frames of reference.
We are encouraged further in this by our ability to transform observed spatial measurements into temporal measurements and vice versa as we seek to describe the facts as observable from
various inertial frames of reference.
Whenever a second material object is considered, then relative to
an inertial frame of reference the two material objects attract each other with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance separating them.
Einstein then boldly formulated the principle of special relativity: The speed of light is a constant in
all inertial frames (frames that move at constant velocity).
My problems started very early on, with its very dry discussion of
inertial frames in the second chapter.
First law: In
an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity, unless acted upon by a force.
Special relativity indicates that, for an observer in
an inertial frame of reference, a clock that is moving relative to him will be measured to tick Moving Checklist You may not be able to move mountains, but you can plan an organized move with a little help from this step - by - step timeline.