Understanding Tools and Machines

Mini-Quiz: Efficiency of Machines

SCSchool for Champions LLC

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

QUIZ

Self-check your understanding

How could you make pushing an object up a ramp more efficient?
By reducing the friction with rollers or lubricantsThat is correct. You know your machines. You can't increase the efficiency due to the Conservation LawSorry, not correct. Try another button. By using two people to push the objectGood try, but not right. Select another answer.
If 50% of the input energy is lost to friction, what is the efficiency of the machine?
5%Oops! Wrong answer. Re-read the question and try again. 50%Correct. You are very efficient! 500%Sorry, not correct. Try another button.
Can a machine be 100% efficient?
Yes, if it is powered by nuclear energyOops! Wrong answer. Re-read the question and try again. It depends on the size of the machineGood try, but not right. Select another answer. No, because of losses due to friction, heat and other factorsThat is correct. You know your machines.

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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

Websites

The Efficiency of Machines (PDF) – Carolina Curriculum

Mechanical Efficiency – Wikipedia

Machines Resources

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Self-check your understanding

Resources and references

Websites

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