- published: 27 Aug 2015
- views: 24165
The most common relative directions are left, right, forward(s), backward(s), up, and down. No absolute direction corresponds to any of the relative directions. This is a consequence of the translational invariance of the laws of physics: nature, loosely speaking, behaves the same no matter what direction one moves. As demonstrated by the Michelson-Morley null result, there is no absolute inertial frame of reference. There are definite relationships between the relative directions, however. Left and right, forward and backward, and up and down are three pairs of complementary directions, each pair orthogonal to both of the others. Relative directions are also known as egocentric coordinates.
Since definitions of left and right based on the geometry of the natural environment are unwieldy, in practice, the meaning of relative direction words is conveyed through tradition, acculturation, education, and direct reference. One common definition of up and down uses gravity and the planet Earth as a frame of reference. Since there is a very noticeable force of gravity acting between the Earth and any other nearby object, down is defined as that direction which an object moves in reference to the Earth when the object is allowed to fall freely. Up is then defined as the opposite direction of down. Another common definition uses a human body, standing upright, as a frame of reference. In that case, up is defined as the direction from feet to head, perpendicular to the surface of the Earth. In most cases, up is a directionally oriented position generally opposite to that of the pull of gravity.
UPRIGHT Posture Trainer
How To Perform the Upright Row - Exercise Tutorial
How To: Smith Machine- Upright-Row
How To: Barbell Upright Row
Guided Upright in Lightroom CC
Cliff Burton - Anesthesia (Upright Bass cover)
All About That [Upright] Bass - Meghan Trainor Cover PMJ ft. Kate Davis
UPRIGHT ROWS WITH DUMBBELLS - MY 2 CENTS - Rich Piana
How To: Dumbbell Upright-Row
Upright Bass for Electric Bassists [ AN's Bass Lessons #17 ]
I gotta be livin' upright, 'cause they say
You should never be too tight - here today
I wanna do something special with my life
So I'll adjust my thinkin' - do it right
An' I have seen you've really touched my heart
I am a girl
Who likes to swim against the tide
My time has come
I hope you will stay on my side tonight
It is OK
I know there's nothin' you could hide away
I gotta be livin' upright, 'cause they say
You should never be too tight - here today
I wanna do something special with my life
So I'll adjust my thinkin' - do it right
An' you have come to me to fit the part
An' I have seen you've really touched my heart
I'm givin' up
I just can't let you leave again
Can't make it stop
You are my most important man, my friend
Does feel all right
It shoulda be enough for us tonight
I gotta be livin' upright, 'cause they say
You should never be too tight - here today
I wanna do something special with my life
So I'll adjust my thinkin' - do it right
It is OK
I'll prove to you, so you will see you'll have to stay today