1.1Introduction to How Things Work

2.1.1 Skating Introduction

2.1.2 Why Does a Motionless Skater Tend to Remain Motionless_

2.1.3 Why Does a Moving Skater Tend to Continue Moving_

2.2.1 How Can We Describe the Fluid, Effortless Motion of a Coasting Skater_

2.2.2How Does a Skater Start, Stop, or Turn_

2.2.3 Why Does a Skater Need Ice or Wheels in Order to Skate_

2.3.1 Skating Summary

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