List of Topics

SfC Home > Physical Science > Machines >


Mini-Quiz: Bearings Reduce Friction

by Ron Kurtus (21 May 2014)

Take this Mini-Quiz to check your understanding of the lesson material.

1. When are roller bearings used instead of ball bearings?

When the the friction must be increased for moving an object

When the load is too heavy for ball bearings

Whenever an axle is not required

2. Why is the friction less with ball bearings?

The friction is actually greater than with roller bearings

Only two ball bearings are needed

The point of contact is very small

3. What is the mechanical advantage when using bearings?

The sliding coefficient of friction divided by the rolling coefficient

There is no mechanical advantage in using bearings

The rolling coefficient of friction divided by the sliding coefficient

If you got all three correct, you are on your way to becoming a Champion in Understanding Machines. If you had problems, you had better look over the material again.

Keep your bearings in tough situations

Resources and references

Ron Kurtus' Credentials


Mechanical Bearing - Wikipedia

Rolling-element bearing - Wikipedia

Roller Bearing Vs. Ball Bearing -

Machines Resources


Top-rated books on Simple Machines

Top-rated books on Machines

Questions and comments

Do you have any questions, comments, or opinions on this subject? If so, send an email with your feedback. I will try to get back to you as soon as possible.

Share this page

Click on a button to bookmark or share this page through Twitter, Facebook, email, or other services:


Students and researchers

The Web address of this page is:

Please include it as a link on your website or as a reference in your report, document, or thesis.

Copyright © Restrictions

Where are you now?

School for Champions


Mini-Quiz: Bearings Reduce Friction

Topics on Machines

Simple machines

Mechanical advantage



Other machines


Also see

Let's make the world a better place

Be the best that you can be.

Use your knowledge and skills to help others succeed.

Don't be wasteful; protect our environment.

You CAN influence the world.

Live Your Life as a Champion:

Take care of your health

Seek knowledge and gain skills

Do excellent work

Be valuable to others

Have utmost character

Be a Champion!

The School for Champions helps you become the type of person who can be called a Champion.