The Work Energy Principle is one of the big ideas in introductory physics courses. It's so big that the textbook presentation can get a little confusing - but it doesn't have to be that way. I haven't ...

JONNY NELSON: Energy. There are lots of different types and lots of different ways of storing it. Chemical energy in a sparkler, elastic potential energy that fires a toy into the air, and many, many ...

Source: NOVA: "Secrets of Lost Empires II: Medieval Siege" This media asset was adapted from NOVA: "Secrets of Lost Empires II: Medieval Siege" In medieval times, one of the most fearsome weapons was ...

We walk here, we walk there, we walk everywhere. Maybe you’re headed to work or to lunch in a busy city. You’re expending energy, and the exercise is good for you. But what if, on top of that, we ...

The search for more energy to meet humankind’s seemingly inexhaustible needs is perennial. The disastrous Fukushima Daiichi nuclear power plant meltdown in Japan earlier this year has resulted in the ...