A scalar is any positive or negative physical quantity that can be
completely specified by its magnitude.
A vector is any physical quantity that requires both a magnitude and
direction for its complete description. A vector is shown graphically by
an arrow. The length of the arrow represents the magnitude of the
vector, and a fixed axis defines the direction of its line of action .The
head of the arrow indicates the sense of direction of the vector (Fig 2-1)
Fig(a)
2.2 Vector operations:-
Multiplication and division of vector by a scalar:
If a vector is multiplied by a positive scalar, its magnitude is increased
by that amount. When multiplied by a negative scalar it will also
change the directional sense of the vector (Fig 2-2).
Amrani
Vector addition
All vector quantities obey the parallelogram law of addition. Fig 2-3 and Fig 2-4 and Fig 2-5 illustrates addition of vectors ?? and ?? to obtain a resultant ?? .
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 .
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