Wheels That Don't Roll

Think about a doorknob. The knob is a wheel. You use your hand to turn it. The axle is connected to the knob. It runs through the door. You use force to turn the knob. The knob then turns the axle. The axle moves the latch in and out.

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wheel

All of these objects use a wheel and axle.

axle

wheel

axle

wheel

Wheels and Axles Can Be Fun

What about a Ferris wheel? It’s just a large wheel and axle. Its motor supplies the force to turn the axle. The axle makes a small circle. It travels a short distance.

The cars at the outer edge of the wheel make a bigger circle. They move a longer distance. The big circle lets the riders climb high into the sky. What a view!

A Ferris wheel is a HUGE wheel and axle!

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Print directions ›

Turn the large gear to the right. Which way does the small gear turn?

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Getting in gear

Gears change the force, speed, or direction of motion within a machine. See how these gears work together. Click and hold down the "left” or "right" button to turn the large gear.

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Abraham Lincoln was important to American history. What do the objects he left behind tell us about this man?

By Brenna Maloney

Before you read

Human Journey

U. S. History

As you read, think about how different historical items can help you understand the past.

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Go to article: Pioneer Go to article: In This Issue Go to article: Lions on the Loose Go to article: A Fish Out of Its Waters & Getting a Fin-hold - Lions on the Loose Go to article: How Bad Is It & New Rules - Lions on the Loose Go to article: Deadly Predator - Lions on the Loose Go to article: Searching for Solutions, Fishing Tournaments, A Fishy Fare and Setting a Trap - Lions on the Loose Go to article: Simple Machines - Round and Round with Wheels and Axles Go to article: It's Simple and Machines That Go Round - Simple Machines: Wheels and Axles Go to article: Wheels That Don't Roll, Wheels and Axles Can Be Fun and Going Along for the Ride - Simple Machines: Wheels and Axles Go to article: Getting in Gear - Simple Machines: Wheels and Axles Go to article: Saving History Go to article: Preparing for Important Guests and Ford's Theatre - Saving History Go to article: To Protect and Preserve, The Path to Preservation and My Career - Saving History Go to article: Explorer Classroom Go to article: The End