MOTIONDESCRIBING MOTION:Change in the position of is said to be motion of the object. To describe the motion ofan object, we need a pre-defined coordinate system, called as Reference frame. The origin is usedas the point of observation.The motion along only one axis is called as 1Dimensional motion.The motion in a plane is called as 2 Dimensional motionMotion in a space is called as 3 Dimensional motionFor all the above motions, a pre-defined coordinate system called as reference frame isused.MOTION ALONG A STRAIGHT LINE:The simplest type of motion is the motion along a straight line. Consider the motion of anobject moving along a straight path. The object starts its journey from O which is treated as itsreference point as shown in the figure.Let A, B and C represent the position of the object at different instants. At first, theobject moves through C and B and reaches A. Then it moves back along the same path andreaches C through B. The total path length covered by the object isOA + AC, that is 60 km + 35 km = 95 km.This is the distance covered by the object.Distance: Distance is how far you have travelled. This is the path length ofthe journey.The units are metersIt is a scalar quantity.On the other side, if we consider the distance between the initial and final positions, then this iscalled as Displacement.Displacement: Displacement is the shortest path moved in a particular direction.Units are meters ( ...

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