Gravity is a force that attracts objects towards each other from "summary" of The World of Physics 2nd Edition by John Avison
Gravity, the force that draws objects towards each other, is a fundamental concept in physics. This force is what keeps our feet firmly planted on the ground and holds the planets in their orbits around the sun. Without gravity, objects would float off into space, with no regard for the laws of physics that govern our universe. The concept of gravity was famously explained by Sir Isaac Newton in his law of universal gravitation. According to this law, every particle in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. In simpler terms, this means that the larger an object's mass and the closer it is to another object, the stronger the gravitational force between them. Gravity is a force that is always present, acting on all objects with mass. It is what gives weight to objects on the surface of the Earth and causes them to fall towards the ground when dropped. The strength of gravity depends on the mass of the objects involved and the distance between them. For example, the gravitational force between the Earth and the Moon is strong enough to keep the Moon in orbit around the Earth, despite the vast distance between them. In the context of the larger universe, gravity plays a crucial role in the formation and evolution of stars, galaxies, and other celestial bodies. It is what causes gas and dust to come together to form stars, and keeps galaxies spinning in their cosmic dance. Without gravity, the universe as we know it would not exist, and the laws of physics that govern our world would be fundamentally different.- Gravity is a force that is essential to our understanding of the universe. It is what keeps us grounded on Earth, shapes the structure of the cosmos, and governs the motion of objects on a cosmic scale. Without gravity, the world as we know it would be a very different place, with no order or structure to the natural world.
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