What is translatory motion and what are the different types of translatory motion?

Before discussing translator motion, it is necessary to first grasp the meaning of the term “Motion” from a physics standpoint.  Motion in physics is the phenomena through which an object’s location changes over time. Displacement, distance, velocity, acceleration, speed, and time are all mathematical words used to describe motion. A body’s motion is observed by connecting a frame of reference to an observer and measuring the change in location of the body relative to that frame as time passes. Kinematics is the discipline of physics that studies forces and their effects on motion; dynamics is the branch that studies forces and their effects on motion. An object is said to be at rest, motionless, immobile, stationary, or to have a constant or time-invariant location with respect to its surroundings if it does not change relative to a particular frame of reference. Absolute motion cannot be defined since there is no absolute frame of reference. As a result, everything in the cosmos may be thought to be in motion. In other words, we can say, Motion is a combined property of an object of our interest and an observer. Thus, the terms “in motion” or “at rest” are meaningless without the presence of an observer. Strictly speaking, nothing is ever at absolute rest or in absolute motion.

Two types of movements

Translational motion and rotational motion are the two types of movements. Translational Motion or Translatory Motion is a body motion in which every point of the moving body travels equally in the same line or direction. It is important to note that when a body is in translational motion, its orientation with respect to a fixed point does not change. For instance, a guy strolling along the street, birds soaring in the sky, and so on. When a body shifts or moves from point A to point B, it is said to be experiencing translational motion. In this case, all points of the moving body move evenly and there is no change in orientation.A pure translational motion occurs when all particles of a moving body move parallel to one another. As a result, at every instant of time, all locations of the body have velocities and accelerations in the same direction and magnitude. This body’s points all describe the same trajectories. However, it should be noted that the orientation stays stable with regard to a fixed reference, which distinguishes rotational motion from translation motion. The body travels along an axis in rotational motion, and so its orientation changes, as when the Earth rotates on its axis.In rotational motion, the body travels an angle with change in time, and the motion is described in terms of angular velocity and angular acceleration.

There are two types of translational motion,

  • Rectilinear Motion
  • Curvilinear motion

Rectilinear Motion:The body moves in a straight path in rectilinear motion. For instance, a guy strolling along the street, or a bullet fired from a pistol. It makes no difference whether the motion is uniform or non-uniform in this case. Consider an automobile travelling from point A to point B on a straight road at some random velocity, v.

Because the automobile is going in a straight path and all of its particles are travelling at the same speed and in the same direction, the observer can deduce that the motion is rectilinear. There is also no change in orientation. It should be recalled that the automobile is being assessed as a whole, and the wheels are a component of it.Individually, the wheels exhibit rotional and translational motion.

Curvilinear Motion:The body must move on a curved route in this type of motion. As a result, the body moves in two or three dimensions. This is achievable by guaranteeing that the body does not alter its orientation with regard to time while moving on a curving route. It is reasonable to say that any pure translational motion does not have to be on a straight line. Curvilinear motion is illustrated by the projection of a ball from point A to point B, with the greatest height obtained at point C. This is known as projectile motion, and it is curvilinear in nature.Here, the ball is allowed to move in a curved path with a certain acceleration and velocity, while ensuring the orientation of the ball remains the same. However, if it was a spinner delivering to the batsman, it would not be curvilinear as he would impart a spin to the ball, which would mean the motion is translational as well as rotational in nature.

Few examples of translational motion are,

  • person walking from point A to B
  • Car or bus moving on a road.
  • Ship sailing in the sea.
  • Dog walking.
  • A coin falling straight towards the surface of the earth

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