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Date: 6-3-2016
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Date: 3-12-2020
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Date: 15-9-2020
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Radial Acceleration
If the angular velocity ω is constant, if we have a particle traveling at constant speed in a circle, then α = dω/dt = 0 and there is no tangential acceleration at . However, we have known from almost the beginning of the course that a particle traveling at constant speed v in a circle of radius r has an acceleration directed toward the center of the circle, of magnitude v2 /r , as shown in Figure (1). We will now call this center directed acceleration the radial acceleration ar
Figure 1: Particle moving at a constant speed in a circle of radius r accelerates toward the center of the circle with an acceleration of magnitude ar = v2/r.
If a particle is traveling in a circular orbit, but its speed vt is not constant, then it has both a radial acceleration a r=vt2/ r , and a tangential acceleration at = rα . The radial acceleration is always directed toward the center of the circle and always has a magnitude v2 /r . The tangential acceleration, if it exists, is tangential to the circle, pointing forward (counterclockwise) if α is positive and backward if α is negative. These accelerations are shown in Figure (2).
Figure 2: Motion with radial and tangential acceleration.
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دراسة: وقت ممارسة الرياضة مهم لفقدان الوزن
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ما مدى خطورة الاضطراب الجوي أثناء الطيران؟
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في السيرة النبوية قسم الشؤون الفكرية يدعو للاشتراك في مسابقة أفضل قصة قصيرة
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أكثر من عشرة آلاف طالب يشاركون في الدورات القرآنية الصيفية ببغداد
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في قضاء الهندية المجمع العلمي يحيي ولادة الإمام الرضا (عليه السلام) بمحفل قرآني
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بعد إعلانه دعوة المشاركة مجمع العفاف النسوي يشهد إقبالًا واسعًا للمشاركة في معرضه التسويقي
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