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# Static Equilibrium and Elasticity

الكلية كلية التربية للعلوم الصرفة     القسم قسم الفيزياء     المرحلة 1
أستاذ المادة فؤاد عطية مجيد       29/05/2018 09:25:09
Rigid Body Kinematic
8.1 Rigid body
Object in the real world are not point- like particles that we have been dealing with up to now. A real object has a mass distribution associated whit its size and shape. The motion of the real object involves both:
Translational motion of the center of mass.
Rotational motion about an axis (usually take to be an axis through the center of mass or some other fixed axis). We will restrict our discussions to that of the rigid bodies. A rigid body is one in which the relative coordinates connecting all the constituent particles remain constant.
8.2 Rotation about a Fixed Axis
Consider motion around the z-axis. Reference point p represent the rotational motion of the body and of its angular position. Given a reference point p, its angular position is measured by the angle ?, between the position vector r ? and the x-axis. As the particle moves from the positive x- axis ?=0 to the point p it move through an arc length