Key words: Friction, physics, physical science, walking, writing, pencil, eraser, ice, automobile brakes, tires, coefficient, sliding, rolling, lubrication, energy waste, heat, loss, wear, shoe, sole, Ron Kurtus, School for Champions. Copyright © Restrictions
Uses of Friction
by Ron Kurtus (revised 21 May 2009)
Although you normally hear about trying to reduce or eliminate friction, it actually has some important uses.
Quite often uses of frction can be seen from how things would be without friction.
Without friction, you would not be able to walk, drive a car, or hold objects. Pens and pencils would not work, s could not move
Since friction is a resistance force that slows down or prevents motion, it is necessary in many applications to prevent slipping or sliding. In those cases, there is an advantage of having friction. However, too much friction can be a nuisance, because it can hinder motion and cause the need for expending extra energy. A good compromise is necessary to get just enough friction.
Uses of friction >>> Writing, walking, driving (moving forward and slowing down), holding things,
Questions you may have include:
- What are important uses of friction?
- How is friction a nuisance?
- What is a good compromise for using friction?
This lesson will answer those questions. Useful tool: Units Conversion
Friction is necessary to move things forward. You need friction to be able to walk, to move a vehicle,
In some situations, friction is very important and beneficial. There are many things that you could not do without the force of friction.
You could not walk without the friction between your shoes and the ground. As you try to step forward, you push your foot backward. Friction holds your shoe to the ground, allowing you to walk. Consider how difficult it is to walk on slippery ice, where there is little friction.
Bear did not heed warning sign
Writing with a pencil requires friction. You could not hold a pencil in your hand without friction. It would slip out when you tried to hold it to write. The graphite pencil led would not make a mark on the paper without friction.
A pencil eraser uses friction to rub off mistakes written in pencil lead. Rubbing the eraser on the lead wears out the eraser due to friction, while the particles worn off gather up the pencil lead from the paper.
Your car would not start moving if it wasn't for the friction of the tires against the street. With no friction, the tires would just spin. Likewise, you could not stop without the friction of the brakes and the tires.
Friction is necessary in many applications to prevent slipping or sliding. But also, it can be a nuisance because it can hinder motion. A good compromise is necessary to get just enough friction or a proper combination of frictions.
Observe little things around you
Resources and references
Friction Concepts - HyperPhysics
Friction - Wolfram Research Science World
Friction Resources - Extensive list
The following books are available from Amazon.com.
Complete Idiot's Guide To Physics by Johnnie T. Dennis; Alpha (2003) $18.95
What Is Friction? (Ages 4-8) by Lisa Trumbauer; Children's Press (CT) (2004) $4.95
Friction Science and Technology (Mechanical Engineering Series) by Peter J. Blau; Marcel Dekker Pub. (1995) $89.95
Physics of Sliding Friction (NATO Science Series E:) by B.N. Persson, E. Tosatti; Springer Pub. (1996) $358.00
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Uses, Advantages and Disadvantages of Friction