Chapter 25 Measurements...............................................................................................................................238 Chapter 26 Density.............................................................................................................................................253 Chapter 27 Motion..............................................................................................................................................262 Chapter 28 Forces...............................................................................................................................................274 Chapter 29 Energy..............................................................................................................................................283 Chapter 30 Current Electricity..........................................................................................................................293 Chapter 31 Electronic Circuits..........................................................................................................................306 Chapter 32 Electrical Power and Efficiency...................................................................................................315 Chapter 33 Technology and the Physical World ..........................................................................................322
Unit 5
Earth and Space
Chapter 34 Celestial Objects ............................................................................................................................328 Chapter 35 The Origin of the Universe...........................................................................................................340 Chapter 36 The Earth-Sun-Moon System......................................................................................................347 Chapter 37 Cycling of Matter............................................................................................................................361 Chapter 38 Space Exploration..........................................................................................................................371 Chapter 39 Energy Sources and Future Needs.............................................................................................378 Chapter 40 Climate Change.............................................................................................................................387
Glossary of Key Terms.................................................................................................................................................. 395 Index................................................................................................................................................................................ 404 Acknowledgements...................................................................................................................................................... 416