motion

Examples of motion in the following topics:

• Perceiving Motion

  • Motion perception happens in two ways that are generally referred to as first-order motion perception and second-order motion perception.
  • First-order motion perception occurs through specialized neurons located in the retina, which track motion through luminance.
  • However, this type of motion perception is limited.
  • One advantage to feature-tracking is that motion can be separated both by motion and by blank intervals where no motion is occurring.
  • Visual illusions offer insight into how motion is perceived.

• Defining Kinematics

  • Kinematics is the study of the motion of points, objects, and groups of objects without considering the causes of its motion.
  • Kinematics is the branch of classical mechanics that describes the motion of points, objects and systems of groups of objects, without reference to the causes of motion (i.e., forces).
  • The study of kinematics is often referred to as the "geometry of motion."
  • Objects are in motion all around us.
  • The word "kinematics" comes from a Greek word "kinesis" meaning motion, and is related to other English words such as "cinema" (movies) and "kinesiology" (the study of human motion).

• Types of Motion

  • There are four types of contrapuntal motion between two musical lines.
  • In parallel motion, two voices move in the same direction by the same generic interval.
  • This will always be true when two voices move in parallel motion.
  • In similar motion, also called direct motion, two voices move in the same direction, but by different intervals.
  • This will always be the case with similar or direct motion.

• Circular Motion

  • Uniform circular motion describes the motion of an object along a circle or a circular arc at constant speed.
  • It is the basic form of rotational motion in the same way that uniform linear motion is the basic form of translational motion.
  • However, the two types of motion are different with respect to the force required to maintain the motion.
  • Let us consider Newton's first law of motion.
  • Therefore, uniform linear motion indicates the absence of a net external force.

• Overview of Non-Uniform Circular Motion

  • Non-uniform circular motion denotes a change in the speed of a particle moving along a circular path.
  • What do we mean by non-uniform circular motion?
  • The answer lies in the definition of uniform circular motion, which is a circular motion with constant speed.
  • The circular motion adjusts its radius in response to changes in speed.
  • In non-uniform circular motion, the magnitude of the angular velocity changes over time.

• Time and Motion

  • Another technique for implying motion and/or time is the placement of a repeated element in different areas within an artwork.
  • Visual experiments in time and motion were first produced in the mid-19th century.
  • While static art forms have the ability to imply or suggest time and motion, the time-based mediums of film, video, kinetic sculpture, and performance art demonstrate time and motion by their very definitions.
  • All of these mediums use time and motion as a key aspect of their forms of expression.
  • Name some techniques and mediums used by artists to convey motion in both static and time-based art forms

• Constant Acceleration

  • Analyzing two-dimensional projectile motion is done by breaking it into two motions: along the horizontal and vertical axes.
  • Projectile motion is the motion of an object thrown, or projected, into the air, subject only to the force of gravity.
  • The motion of falling objects is a simple one-dimensional type of projectile motion in which there is no horizontal movement.
  • The key to analyzing two-dimensional projectile motion is to break it into two motions, one along the horizontal axis and the other along the vertical.
  • We analyze two-dimensional projectile motion by breaking it into two independent one-dimensional motions along the vertical and horizontal axes.

• Motion Diagrams

  • A motion diagram is a pictorial description of an object's motion and represents the position of an object at equally spaced time intervals.
  • A motion diagram is a pictorial description of the motion of an object.
  • For this reason, a motion diagram is more information than a path diagram.
  • is a motion diagram of a simple trajectory.
  • Motion diagram of a puck sliding on ice.

• Simple Harmonic Motion and Uniform Circular Motion

  • Simple harmonic motion is produced by the projection of uniform circular motion onto one of the axes in the x-y plane.
  • Uniform circular motion describes the motion of a body traversing a circular path at constant speed.
  • There is an easy way to produce simple harmonic motion by using uniform circular motion.
  • The next figure shows the basic relationship between uniform circular motion and simple harmonic motion.
  • Describe relationship between the simple harmonic motion and uniform circular motion

• A Quantitative Interpretation of Motional EMF

  • A a motional EMF is an electromotive force (EMF) induced by motion relative to a magnetic field B.
  • An electromotive force (EMF) induced by motion relative to a magnetic field B is called a motional EMF.
  • Therefore, the motional EMF over the length L of the side of the loop is given by $\varepsilon_{motion} = vB \times L$ (Eq. 1), where L is the length of the object moving at speed v relative to the magnet.
  • From Eq. 1 and Eq. 2 we can confirm that motional and induced EMF yield the same result.
  • (a) Motional EMF.