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In Laban Movement Analysis and Space Harmony (Choreutics) the same 27 direction symbols are used but they have a different conceptualization. Instead of envisaging the signs on three parallel horizontal planes (high, middle, and low levels), the direction signs are organized according to the octahedron, cube , and the icosahedron.
Each "direction symbol" indicates the orientation of a line between the proximal and distal points of a body part or a limb. [7] That is, "the direction signs indicate the direction towards which the limbs must incline". [8] The direction symbols are organized as three levels: high, middle, and low (or deep):
direction: unitless impact parameter meter (m) differential (e.g. ) varied depending on context differential vector element of surface area A, with infinitesimally small magnitude and direction normal to surface S: square meter (m 2) differential element of volume V enclosed by surface S
Kinematics is used in astrophysics to describe the motion of celestial bodies and collections of such bodies. In mechanical engineering, robotics, and biomechanics, [7] kinematics is used to describe the motion of systems composed of joined parts (multi-link systems) such as an engine, a robotic arm or the human skeleton.
The 'south'-direction x-axis is depicted but the 'north'-direction x-axis is not. (As in physics, ρ is often used instead of r to avoid confusion with the value r in cylindrical and 2D polar coordinates.) According to the conventions of geographical coordinate systems, positions are measured by latitude, longitude, and height (altitude).
For example, consider a book at rest on a table. The Earth's gravity pulls down upon the book. The "reaction" to that "action" is not the support force from the table holding up the book, but the gravitational pull of the book acting on the Earth. [note 6] Newton's third law relates to a more fundamental principle, the conservation of momentum.
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In geometry and mechanics, a displacement is a vector whose length is the shortest distance from the initial to the final position of a point P undergoing motion. [1] It quantifies both the distance and direction of the net or total motion along a straight line from the initial position to the final position of the point trajectory.