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23_first_law

23_first_law - Lesson 23 Newton's First Law(Inertia Newtons...

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Lesson 23: Newton's First Law (Inertia) Newton’s Laws of Motion, as written in his book the Principia , are actually very difficult to read. At the time, Newton didn’t care too much about the “readability” of his book. He just wanted to get the stuff put down on paper. As a result, the way we state his laws today, and the formulas we use, are in some ways different from the way he originally wrote them. They still mean the same thing. He actually wrote the laws in a specific order for a specific reason. As we go through the laws, you should realize that he builds one on top of the other. The First Law (The Law of Inertia) Every body continues in a state of rest or uniform velocity in a straight line , unless an external force acts on it .” Every body …” Means any physical object in the universe that has mass. It can be here on the Earth, on the moon, floating in space, wherever. “… continues in a state of rest or uniform velocity in a straight line …” If it is sitting still, it will stay that way. If it is moving, it will keep on moving forever at that

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23_first_law - Lesson 23 Newton's First Law(Inertia Newtons...

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