what is force of attraction....? and also tell me that in which condition the free attraction is less?
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Newton's equation first appeared in the Philosophiæ Naturalis Principia Mathematica, July 1687. It describes why that apple fell from that tree in that orchard in Lincolnshire. Whether or not that apple actually landed on Isaac Newton's head, as some stories would have it, this equation describes why you stay rooted to the ground, what locks the Earth in orbit around the sun and was used by Nasa engineers to send men to the moon.
It encapsulates the idea that all the particles of matter in the universe attract each other through the force of gravity – Newton's law tells us how strong that attraction is. The equation says that the force (F) between two objects is proportional to the product of their masses (m1 and m2), divided by the square of the distance between them. The remaining term in the equation, G, is the gravitational constant, which has to be measured by experiment and, as of 2007, US scientists have measured it at 6.693 × 10−11 cubic metres per kilogram second squared.
It encapsulates the idea that all the particles of matter in the universe attract each other through the force of gravity – Newton's law tells us how strong that attraction is. The equation says that the force (F) between two objects is proportional to the product of their masses (m1 and m2), divided by the square of the distance between them. The remaining term in the equation, G, is the gravitational constant, which has to be measured by experiment and, as of 2007, US scientists have measured it at 6.693 × 10−11 cubic metres per kilogram second squared.
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