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Text about gravity

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  • Course Text about gravity


    الجاذبية واحدة من أربع قوى أساسية تتحكم في الطبيعة، والقوى الأخرى هي القوى الكهرومغناطيسية التي تنشأ كنتيجة مباشرة لحركة الشحنات، والقوى النووية القوية المسؤولة عن الترابط بين البروتونات والنيوترونات داخل الذرة، والقوى النووية الضعيفة التي تُعطي نشاطًا إشعاعيًّا لنواة الذرة. ولا يهمنا الحديث عن الجاذبية إلا عندما نتحدث عن الأجسام الكبيرة مثل الكواكب ذلك أنَّ الجاذبية لها قوة تؤثر في أجسام أخرى على مسافات بعيدة، بينما نجد أنَّ القوة النووية لا تؤثر إلى في المسافات القريبة جداً بل تضعف كثيراً بسرعة أيضاً مع امتداد المسافات. والأمر الثاني أنَّ الجاذبية دائماً قوة جاذبة للأجسام الأخرى. ولفهم ذلك، ننظر في المقابل إلى القوى الكهرومغناطيسية، تلك القوى التي تختلف من جزيء لآخر فقد تكون نابذة أو قد تكون جاذبة حسبما إذا كانت شحنة الجزيء سالبة أو موجبة. أما الجاذبية فهي تجذب الأجسام دائماً وليس فيها أي قوة نابذة.


    Rana

  • #2
    Gravity is one of the four fundamental forces that control nature. Other forces include: electromagnetic force which is an immediate outcome of charged particles’ motion, strong nuclear forces which bind neutrons and protons within the atom, and weak nuclear forces which produce radiation activity in the atom nucleus. Gravity comes into our minds just upon talking about huge bodies like planets since gravity’s force affects other objects at far distances. On the contrary, nuclear force has no effect except in short distances, moreover it fades quickly when distances expand. Secondly, the gravity is always a pulling force that attract other masses. To understand this, we look in contrast to electromagnetic force, which produces attraction or repulsion force and this variation occurs according to the particle’s charge whether it is negative or positive. Gravitational force, on the contrary, always pulls objects and has no repulsion force.

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    • Mohammed
      Mohammed commented
      Editing a comment
      1. Gravity is one of the four fundamental forces that control nature. Other forces include electromagnetic, force which is an immediate outcome of charged particles’ motion, strong nuclear forces, which bind neutrons and protons within the atom, and weak nuclear forces, which produce radiation activity in the atom nucleus. Gravity comes into our minds just upon talking about massive bodies like planets, since gravity’s force affects other objects at far distances. In contrast, nuclear force has no effect except in short distances. Moreover, it fades away quickly when distances expand. Secondly, gravity is always a pulling force that attracts other masses. To understand this, we look in contrast to electromagnetic force, which produces attraction or repulsion force, depending on whether a particle’s charge is positive or negative. Gravitational force, in contrast, always pulls objects and has no repulsion force.

      2. Gravity is one of the four fundamental forces that control nature. The other forces are electromagnetic, force, which results directly from the motion of charged particles; strong nuclear forces, which bind neutrons and protons within the atom, and weak nuclear forces, which produce radiation activity in the atom nucleus. Our minds automatically turn to gravity as soon as we discuss massive bodies like planets, as gravity's force is capable of influencing objects from a long distance. Contrary to this, nuclear force does not exert any effect beyond a short distance and diminishes rapidly when distances expand. Secondly, gravity is always a force that draws other masses toward it. We can better understand this by contrasting it with electromagnetic force, which produces both attraction and repulsion depending on whether a particle has a positive or negative charge. In contrast, gravitational force always attracts objects and does not repel them.

  • #3
    “Gravity is one of the four fundamental forces of nature. The other three are Electromagnetic Force, which is the direct result of the movement of electrical charges; Strong Nuclear Force, which is responsible for holding together protons and neutrons within an atom; and Weak Nuclear Force which emits the radioactivity of the nucleus of an atom. What matters to us when speaking about gravity is within the context of large bodies such as planets as it is a force that affects other bodies at extreme distances. On the other hand, nuclear force has no affect except at very short distances and it quickly becomes very weak as the distances increase. Additionally, gravity is always a force that attracts other bodies. To understand this, let us look at Electromagnetic Force, which differs from one molecule to another. It can be centrifugal or magnetic according to whether the molecular charge is negative or positive. Gravity, on the contrary, always attracts bodies and does not have a centrifugal force.”
    Last edited by John; 10-28-2022, 06:09 PM.

    Comment


    • Mohammed
      Mohammed commented
      Editing a comment
      Hi John. I will come back to you in two days.

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