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    Gravity is a natural phenomenon in which all physical bodies are attracted to each other. It is commonly witnessed as the agent that gives weight to objects with mass and causes them to fall to the ground when dropped. It is also the same agent that allows your feet to stay on the ground.
    Gravity is one four fundamental interactions of nature. The other three include electromagnetism, nuclear strong force and weak force. Gravitational force is the only fundamental force that affects all matter. This force is proportional to the masses of the interacting bodies.

    The cosmological perspective of gravitation says it causes dispersed matter to coalesce matter to remain intact. This accounts for the existence of planets, galaxies, stars and most macroscopic objects in the universe. Gravity is also responsible for keeping the Planets in orbit around the sun.
    Gravity is what keeps the moon in its orbit around the Earth. The moons gravitational pull is what influences the tides. This occurs by natural convection by the density gradient.

    Every planet is surrounded by its own unique gravitational field. The gravitational field is numerically equal to the acceleration of objects under its influence. Earth’s acceleration due to gravity is 9.80665 m/s2 or 32.1740 ft/s2. This is ignoring air resistance.

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    Lorentz transform of the components of the velocity

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    Gravitational time dilation

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    Motion Problems

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