Definition of the term MOTION

In physics, motion is a change in position or orientation of an object over time.



Motion along a line or a curve is called translation. Motion that changes the orientation of a body is called rotation. In both cases all points in the body have the same velocity (directed speed) and the same acceleration (time rate of change of velocity). The most general kind of motion combines both translation and rotation.

All motions are relative to some frame of reference. Saying that a body is at rest, which means that it is not in motion, merely means that it is being described with respect to a frame of reference that is moving together with the body. For example, a body on the surface of the Earth may appear to be at rest, but that is only because the observer is also on the surface of the Earth. The Earth itself, together with both the body and the observer, is moving in its orbit around the Sun and rotating on its own axis at all times. As a rule, the motions of bodies obey Newton’s laws of motion. However, motion at speeds close to the speed of light must be treated by using the theory of relativity, and the motion of very small bodies (such as electrons) must be treated by using quantum mechanics.
As there is no absolute frame of reference, absolute motion cannot be determined. Thus, everything in the universe can be considered to be moving.


Types of motion

  • Simple harmonic motion – (e.g., that of a pendulum).
  • Anharmonic motion
  • Periodic motion
  • Linear motion – motion which follows a straight linear path, and whose displacement is exactly the same as its trajectory.
  • Reciprocal motion (e.g. vibration)
  • Random motion (e.g. vibration)
  • Brownian motion (i.e. the random movement of particles)
  • Circular motion (e.g. the orbits of planets)
  • Rotary motion – a motion about a fixed point. (e.g. Ferris wheel).
  • Curvilinear motion – It is defined as the motion along a curved path that may be planar or in three dimensions.
  • Rotational motion
  • Rolling motion - (as of the wheel of a bicycle)
  • Oscillation - (swinging from side to side)
  • vibratory motion
  • Combination (or simultaneous) motions - Combination of two or more above listed motions
  • Projectile motion - uniform horizontal motion + vertical accelerated motion
  • Half projectile motion
  • circular motion (this is a motion that move in a round of body)(e.g. the moon and the earth)
(c) Wikipedia


Art created before the twentieth century consisted of mostly landscape and portrait paintings: empty nature scenes or stationary people standing or sitting still, posing for the artist.

The beginning of the twentieth century was a revolutionary time in the history of art, with modern artists for the first time trying to come up with new and often avant-garde ways to capture images on a canvas. The futurist movement in particular was dedicated to capturing both time and motion in art, creating paintings of movement.

 
http://historyartmotion.blogspot.com/

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