Title TOPIC 8 LINEAR MOTION - WazaElimu.com.pdf ✅

66 TOPIC 8: LINEAR MOTION CONCEPT OF MOTION An object is said to be in continuously changing relative to a reference point such as an observer or a detection device. For example, when we walk or run our position is continuously changing with respect to the ground. Hence: LINEAR MOTION  This is the motion or movement of an object in a straight line. DISTANCE AND DISPLACEMENT To define the position of an object we first choose a frame reference. FRAME REFERENCE  This set of axes from which an observer can measure the position and motion of points in a system. 1. DISTANCE (d)  This is the length between two points taken by a body while in motion.  The SI – Unit of distance is meter (m)  Other units of distance are cm, mm and km. o Distance is a scalar quantity since it has magnitude without direction. 2. DISPLACEMENT (S)  This is the distance covered in a particular direction.  The SI – Unit of displacement is meter (m)  Other units of displacement are cm, mm and km. o Displacement is a vector quantity since it has both magnitude and direction. Consider the figure below which shows the distance and displacement. DIFFERENCES BETWEEN DISTANCE AND DISPLACEMENT