Main Idea Worksheet 5 Directions: Read each passage and ask yourself, "What is the author doing in this paragraph? Write your answer in the summary box and then think of an appropriate title for the passage based on the main idea of the passage. 1. Sir lsaac Newton was contemplating the universe in his garden one day in 1665 when he noticed an apple fall from a tree. Newton wondered to himself, "Why should the apple always fall to the ground? Why does it not go sideways or upwards but directly toward the Earth"s center?" After much contemplation Newton concluded that objects are pulled to the Earth through a force that he called gravity, which means heaviness in Latin. On July 5 . 1687 Newton formally expressed his law of universal gravitation in series of books called The Principia. Summarize this paragraph in one sentence. Be specific and clearly explain the main idea.