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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

Websites

Mechanical Bearing - Wikipedia

Rolling-element bearing - Wikipedia

Roller Bearing Vs. Ball Bearing - eHow.com

Machines Resources

Books

Top-rated books on Simple Machines

Top-rated books on Machines


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