Work - What is work? Work is force x distance
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Work

Plowing
Plowing a field

You might think you know what work is, like homework, or having to pick up your room, right? But to scientists, work has a more definite meaning: work is force x distance.

That means that you can measure work by measuring how much force, or energy, it took to move something, and multiplying that by how far you moved it (or how many of them you moved). It takes a certain amount of energy to push a plow through the fields, and it takes more energy to push it up and down four furrows than it takes to push it down only one furrow. It takes a certain amount of energy to pick up one bowling ball, and it takes twice as much energy to pick up two bowling balls. If you move two bowling balls one mile, you've done the same amount of work as moving one bowling ball two miles.

To make work easier, people use machines like levers, pulleys, wedges, and inclined planes.

Bibliography and further reading about work:

Machines
Physics
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Professor Carr

Karen Eva Carr, PhD.
Assoc. Professor Emerita, History
Portland State University

Professor Carr holds a B.A. with high honors from Cornell University in classics and archaeology, and her M.A. and PhD. from the University of Michigan in Classical Art and Archaeology. She has excavated in Scotland, Cyprus, Greece, Israel, and Tunisia, and she has been teaching history to university students for a very long time.

Professor Carr's PSU page

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Now that the weather's nice, try some of these outdoor activities! How about bicycle polo, or archery for a Medieval Islam day? Or kite flying or making a compass for a day in Medieval China? How about making a shaduf for a day in Ancient Egypt? Holding an Ancient Greek Olympic Games or a medieval European tournament? Building a Native American wickiup?