1. Physics in the world around us

Energy can change from motion to heat, light, sound, or electricity, yet the total is conserved. This powerful idea connects roller coasters, batteries, food, engines, and distant stars.

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GPS uses relativity, phones rely on electromagnetism and quantum physics, and buildings depend on forces and materials. Everyday tools often work because physical effects can be measured and controlled.

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Physics reaches from particles smaller than atoms to galaxies spanning millions of light-years. Questions about quantum uncertainty, black holes, time, and the origin of the universe show how strange nature can be.

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Physicists and physics-trained people work in research, engineering, medicine, energy, climate science, computing, education, and space technology. They build instruments, analyze evidence, simulate systems, and solve problems in collaborative communities.

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Review this chapter with practice based on your mistakes.