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Mini-Quiz: Rollers Reduce Friction

by Ron Kurtus (12 March 2014)

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



1. Why is it difficult to drag a heavy object across the ground?

The friction is usually great

There are no handles to hold onto

You are too weak to do the job

2. How do rollers make it easier to move a heavy object?

You are going downhill

You can power the rollers

Friction is much less using rollers

3. What is a simple way to calculate the mechanical advantage?

Divide sliding coefficient of friction by rolling coefficient

Divide rolling coefficient of friction by sliding coefficient

Divide force mechanical advantage by rolling 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 on rolling in your life


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