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We ate apples with gusto.

But the following question arose in Newton's mind.

❑ Why does an apple fall from a tree to the earth?
❑ Why didn't you go upstairs?

❑ A stone thrown sideways moves in the curve path and ultimately falls towards

the earth’s surface?
❑ What causes an object to fall straight to the earth?

❑ If an object falls to the earth, why doesn't the sun and moon fall to the earth?

He concluded that this was due to gravity.