Understanding Physical Science

Mini-Quiz: Overview of Machines

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

QUIZ

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Is a bicycle a machine?
No, because it does not have an engineGood try, but not right. Select another answer. Bicycles have never been studied to determine the answerSorry, not correct. Try another button. Yes, because the output speed can be greater than the inputThat is correct. You know your machines.
If a person uses his 150 pounds of weight to jack up a 3000 pound car, what is the mechanical advantage of the jack?
200Oops! Wrong answer. Re-read the question and try again. 20Correct. Great job! 1/20Sorry, 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 Physics. If you had problems, you had better look over the material again.

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