Printer Friendly

You' re on a roll.

What You'll Need

* a box of tissues (full)

* a few crayons

* a clear, flat surface

What to Do

1. Place the tissue box on the Flat surface.

2. Push the box along the surface. Notice how
much the box resists being moved.

3. Line up the crayons side by side under the
box, as shown above.

4. Push on the end of the box again and see if
it is easier to move.

How It Works

The First time you moved the box, Friction between the bottom of the box and the Flat surface resisted the push. When you moved the box over the crayons, they rolled under the box and over the surface, reducing the friction.

The idea of using round objects to reduce Friction is the basis For the wheel and For the bearings inside wheels. Some scientists have said that the pyramid builders of ancient Egypt might have placed logs under huge blocks of stone to help them move the blocks into place. But others think the Egyptians had even easier ways to reduce Friction. Come up with your own best idea For how to move those big blocks.
COPYRIGHT 2008 Highlights for Children, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2008 Gale, Cengage Learning. All rights reserved.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:friction
Author:Kirchner, Carrie Silchenstedt
Publication:Highlights for Children
Article Type:Brief article
Geographic Code:1USA
Date:Jul 1, 2008
Previous Article:Buried-treasure game.
Next Article:Roadrunner rescue.

Related Articles
New rubber friction testing machine.
PNR for paper roller application.
Technology with a can-do attitude: ceramic bearings let seam roller tooling performs better. (Technology Update).
Low-friction treater roll for lightweight films. (Keeping up with Auxiliaries).
Fine crumb rubber mill.
Rolling bearing analysis, 5th ed.; 2v. (2 CD-ROMs included).
Grosch to receive Charles Goodyear Medal.
Minimum lube roller guides.

Terms of use | Privacy policy | Copyright © 2020 Farlex, Inc. | Feedback | For webmasters