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# Motion in One Dimension (1 D)

الكلية كلية التربية للعلوم الصرفة     القسم قسم الفيزياء     المرحلة 1
أستاذ المادة فؤاد عطية مجيد       06/03/2019 12:47:23
2.1 Position and particle
The position of a particle on an x-axis locate the particle with respect to the origin, or zero point of the axis. The position is either positive or negative, according to which side of the origin the particle is on, or zero if the particle is at origin. The positive direction on an axis is the direction of increasing positive numbers, the opposite direction is the negative direction. The moving object is either a particle (by which we mean a point like object such as electron) or an object that moves like a particle such that move in the same direction and at the same rate). In our study we describe the moving object as a particle regardless of its size.
2.2 Displacement, average velocity and average speed
The motion of a particle is completely known if the particle position in space is known at all times. If a particle is moving we can easily determine its change in position, a charge in position of a particle is called a displacement. When a particle moves from one position x1 to another position x2 its displacement is written as: ???=??2???1 (1)
The symbol ? (delta), represents a change in quantity and it means the final value of that quantity minus the initial value.
Average speed of a particle ??? is defined as total distance travelled divided by the total time it takes to travel that distance
???=???????????????? ?????????????????? ???????? ?????????? ????=???? >0 ???????????? (2)
The average velocity (???) of a particle is defined as a particle’s displacement ??? divided by the time interval ??? during which that displacement occurred when a

المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .