A.5.1 Galilean relativity

an event

A change that takes place at a point in space in a particular time

observer

someone who measures some physical quantity related to an event

frame fo reference

an observer takes measurements, such as the time and position of an event.

an observer can only take measurements in their frame of reference

newton and movement in relativity

All of Newton’s laws apply in each frame of reference, in Galilean relativity there is no absolute movement.

• all movement is relative,

• if there was just you in space technically no movement, nothing to be relative against

inertial reference frame

one in which the motion of a particle not subject to forces is in a straight line at a constant speed

non inertial reference frame

also known as an accelerated reference frame, is a frame of reference that undergoes acceleration with respect to an inertial frame

Galileon transformation

transforming measurements/events from two different frames of reference

assumption of GR

time is absolute, same in every reference frame

Galileon transformations for velocity

bird flying in the same direction as a rocket ship, from in the other rocket ship A the velocity is the velocity of the rocket ship + velocity of the bird

for a person in B with a bird, velocity s just the velocity of bird

TRANSFORMATIONS VECTORS:

take away when in opposite directions

add in same directions

constant variable in Galileon relativity

• acceleration

• time

• length

why cant we distinguish between different inertial reference frames

because motion is relative