Acceleration
A body moving faster and faster in a straight line, in classical physics, is said to be accelerated. A body moving slower and slower in a straight line, in classical physics, is decelerating, or minus acceleration. A body alternating faster and slower in a single direction is said to be accelerated. And finally, a body moving at any rate in any curved trajectory is said to be accelerated. In curved motion, at any instant a body is always trying to go straight by Newton's Law I; thus constantly changing direction in a curve; it is constantly getting a new tangent line away from the curve. In a technical paradoxical manner of speaking: Each instant the body has to slow and stop in the direction it was going, and speed up in the new direction repetitively. (Actually, this phenomena of starting and stopping is is not a reality. Matter in motion has constant internal motion also, and when forced in curved motion the minute body parts are flexing and shifting to make the bending new curve directions, and or the solid body if turning about a corner point, as a hinge flap, is actually flipping, and thus every point on and within the body is moving in various curves. ) In true nature curved motion can involve the atoms and molecules flexing in motion within the body, and can require millions of continual motions to make a turn. It can be demonstrated however that it take successive forces to turn a body... thus multiple forces is not free straight line momentum of Law I.
These writings are not to teach acceleration, but to review, and to focus on the importance of the curved paths of any, and all bodies of matter.
Anytime a body is moving in a curved path is being accelerated!
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Mechanical Acceleration__
Pushing or applying pressure upon a body causing it to move faster and faster... is not difficult to comprehend. If the push is applied to our arm, for example, we can sense the difference compared to normal conditions. We feel the movement of tissue at the local area of contact. This is a sensed differential of pressure within the material makeup of our arm.
Gravitational Acceleration__
However, we do not directly sense Gravitational Acceleration! However, we do sense the sudden stop at the end of a fall! We often sense motion with our sight, relating to our surroundings. We might feel wind passing. And, we feel the weight of objects. But, these are not causing the acceleration.
Why don't we physically feel something pushing us when we drop? Simply because every minute particle in our body is being acted upon almost simultaneously. It was thought, and is now said to be confirmed experimentally, gravity operates at the speed of light. Your body atoms are 99.99999+%... space, and your physical touch sensitivity differential is only good to maybe 1/16 of an inch. From atom to atom you don't have any sensitivity reference. It should not be very difficult for the actions of gravity to act from head to toe almost instantly! So, when an atom in your head is being set into motion__ another within your foot is also starting to move.
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I will elaborate in my section upon Change of State, that no matter however slight, sharp or erratic... when taken to extremes__ any body, is always in curved motion. So when you you put this together with the fact that all curved motion is accelerated motion... the whole Universe is in constant acceleration! This can also be substantiated by the fact that there is no such thing as uniform motion with everything in curved accelerated motion.
All motion in the Universe, is accelerated curved motion.
There will be more on acceleration in the other sections, but this page points out the major reasoning I have have come up with for acceleration: that all curved motion is accelerative, and all motion is curved... thus all motion is accelerative.
Acceleration is a name for an action of motion, not the motion. It describes a type of motion that is a reality. But, acceleration is not the reality. Motion as change of state is the reality. The Universe would be fine without the word called acceleration... It doesn't care what curved motion is called, or any motion, but a Universe without motion as change of state, is in real trouble...
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Page Relevant Quotes
"In mechanical terms, a body is subject to acceleration if the amount of ground covered in unit time is changing (either increasing, so that the body is accelerating in the usual sense of the word, or else decreasing, so that the body is decelerating or slowing down). The body is also said to be undergoing acceleration if its direction of motion is changing, even if its actual velocity along its trajectory is not." Quanta: J. Andrade e Silva, G. Lochak
"Speed is measured in derived units such as mi/hr or m/s, but the statement of a velocity must include a direction.
All velocities are relative. The velocity of a body is always relative to another body. When the other body is not mentioned it is understood to be the earth." Principles of College Physics; George Shortley, Dudley Williams.
