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	402   Directed Inquiry Explore How can you learn about the motion of a pendulum? 404   How to Read Science Cause and Effect 405     You Are There! 406      Lesson 1 How can you describe motion? 407      Lesson 2 What are forces? 410      Lesson 3 What are Newton’s laws of motion? 418      Lesson 4 What are simple machines? 426   Guided Inquiry Investigate How can you describe motion? 432      Gravity, Work, Power 434     Chapter 13 Review and Test Prep 436       Thrust, Rockets, and Airplanes 438       Isaac Newton 440