WHAT'S INSIDE: PHYSICAL SCIENCE

Physical science is the study of the physical world around you. Learn about everything from electricity to magnetism in this section.
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FEATURED: PHYSICAL SCIENCE

Horsepower, a unit of power. Power is the rate at which work is done. One horse-power (abbreviation, HP or hp) equals 550 foot-pounds of work per second.

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How do investigators determine if a wildfire was caused by arson?

Investigators quickly determined that the wildfire that killed five firefighters and burned more than 40,000 acres in Esperanza, CA, was the result of arson.

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