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Why the Principle of Relativity is necessary.

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Newton’s Laws 1. Law of Inertia: Every body continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it. 2. Law of Motion: The change of motion is proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed. F=ma 3. Law of Action and Reaction: To every action there is always opposed an equal reaction; or the mutual actions of two bodies upon each other are always equal and directed to contrary parts.

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The Spinning Bucket

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Water moves towards the edges.

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Newton’s Bucket experiment

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Newton’s Bucket Experiment StageMotionsPerceived Forces (Water drawn towards edge?) Motion observed. (Observing wall of bucket) 1: Let Bucket Spin Bucket Moves Water still NoYes 2:Both Spinning Bucket Moves. Water Moves YesNo 3:Stop Bucket Bucket Still Water Moves Yes 4:Both Stopped Bucket Still Water Still No

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Chapter 4 Newton’s Laws of Motion Sir Isaac Newton Philosophiae Naturalis Principia Mathematica (1687) Opticks (1704) "Nature and nature's laws lay hid.

Chapter 4 Newton’s Laws of Motion Sir Isaac Newton Philosophiae Naturalis Principia Mathematica (1687) Opticks (1704) "Nature and nature's laws lay hid.

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