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Mini-Quiz: Efficiency of Machines

by Ron Kurtus (revised 24 June 2016)

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



1. How could you make pushing an object up a ramp more efficient?

By reducing the friction with rollers or lubricants

You can't increase the efficiency due to the Conservation Law

By using two people to push the object

2. If 50% of the input energy is lost to friction, what is the efficiency of the machine?

5%

50%

500%

3. Can a machine be 100% efficient?

Yes, if it is powered by nuclear energy

It depends on the size of the machine

No, because of losses due to friction, heat and other factors

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.


Use science to make things more efficient


Resources and references

Ron Kurtus' Credentials

Websites

The Efficiency of Machines (PDF) - Carolina Curriculum

Mechanical Efficiency - Wikipedia

Machines Resources

Books

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.


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