# What Is Rectilinear Motion?

Rectilinear motion is found within linear or translational kinematics. This is the description of the motion in space of a point along a line. This line can also be known as a trajectory of a path and if this path is straight, it is said to be rectilinear. In comparison, a curved path is said to be curvilinear.

Kinematics describes the motions of bodies (objects) and systems (groups of objects) without considering the forces that cause these motions. It is a branch of classical mechanics and shouldn’t be confused with analytical dynamics, the study of the relationship between the motion of objects and its causes. Analytical dynamics is sometimes subdivided into kinetics, the study of the relations between external forces and motion, and statics, the study of the relations in a system of equilibrium. Kinematics differs from analytical dynamics due to the fact that it is used in modern-day physics to describe time evolution of a system. While it is not a term that is used as commonly today as it has been in the past, kinematics still has a role in physics, biomechanics and animal locomotion.

Kinematics in its simplest form of application considers particle motion, translational or rotational. At the next level of complexity, kinematics sees the introduction of rigid bodies. These are collections of particles that have time invariant distances between themselves. These rigid bodies may undergo translation and rotation or both. An even more complex application of kinematics is of a system of rigid bodies. Kinematics is used to find a mechanism’s range of movement or to design a mechanism that moves in a desired range. For example, both the movement of a crane and the movement of the oscillations of a piston in an engine are simple kinematic systems. They differ as the crane is a type of open kinematic chain and the piston is part of a four-bar linkage.
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Motion is defined as continuous change of position of a body. Rectilinear motion is defined as that motion which occurs in a straight line. Thus is something or somebody moves in a straight line path then this motion is said to be rectilinear motion. It is said to be a subset of general motion. It can be one dimensional, two dimensional or three dimensional.

It is also often simply known as linear motion. The most important thing in this type of motion is that an object follows a straight line path. Rectilinear motion is often said to be an idealized type of motion that hardly occurs in actual experience. Yet it is the simplest type of motion and the more complicated type of motions are based on rectilinear motions.
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Rectilinear motion is simply the change of a position along a straight line with time
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A motion is set to be in a straght line it is called rectilinear motion.
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Rectilinear motion means motion in a straight line.For eg. rectilinear propagation of light which says light travels in a straight line.
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It is motion of an object in a straight line.when the hole body moves it is locomotion.
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Rectilinear motion when an object in translational motion moves in straight line it is said to be in rectilinear motion. Eg ;  a car moving on a straight line.
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A rectilinear motion is simply known as motion  of a body in straight forward line.for example:-
1. Man waking on a straight lane.
2. Motion of light in a straight  line.     Etc...
MAIN WORD IS STRAIGHT LINE ONLY.
MANY COMPLEX MOTIONS ARE BASED ON THIS SMALL WORD,
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