It's time to go to the amusement park Giant rides loom around you, and countless parts are in motion. But many simple machines are at work too. See the Ferris wheel? That's a wheel and axle. Try your luck at skee-ball. You're using an inclined plane. Find out more about the simple machines behind the excitement.
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15. ThriftBooks.com. Read more. Spend less.