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why did that apple fall on the floor?
The same force that pulled the apple to the ground tugging on the moon.
If the moon is far away then the force would be weaker to pull something down but a single force explained an apple and bodies moving. Newton called this gravity
The strength of the force depended on the masses of the objects and distance between them. For example, the moon, and earth tugged on each other
In 1687, Newton published a book called " Principia" which presented the laws of gravity. Newtons laws provided physical explanations of what earlier scientists discovered
Newotns laws dramatically changed peoples picture of the universe and some people started to see the universe as a beautiful designed machine
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