Ch. 14.3 - Mechanical Advantage and Efficiency
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Physics, Science
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9th Grade
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Jeremy Bosquez
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2 Slides • 7 Questions
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Ch. 14.3
Mechanical Advantage and Efficiency
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3
Multiple Choice
Why is the actual mechanical advantage of a machine always less than its ideal mechanical advantage?
The actual mechanical advantage takes into account friction
The actual mechanical advantage doesn't take into account friction
The actual mechanical advantage doesn't involve force
The actual mechanical advantage is stronger than ideal mechanical advantage
4
Fill in the Blanks
You test a machine and find that it exerts a force of 5 N for each 1 N of force you exert operating the machine. What is the actual mechanical advantage of the machine?
AMA = Output force / Input Force
**There are no units for actual mechanical advantage, just type a number**
Type answer...
5
Multiple Choice
Why can no machine be 100% efficient?
Because machines always have flaws
Because friction is always present
Because of human error
Because batteries run out of power
6
Multiple Choice
Which of the following is the correct equation to calculate efficiency?
(Work Output/Work Input)
(Input Distance/Output Distance) x 100%
(Work Output/Work Input) x 100%
(Input Force x Input Distance) x 100%
7
Open Ended
Suppose you are an inventor in 1900. You are constructing a bicycle of your own design. What could you do to ensure your bicycle efficiently changes the work input into forward motion?
8
Fill in the Blanks
You have just designed a machine that uses 1000 J of work from a motor for every 800 J of useful work the machine supplies. What is the efficiency of your machine?
Efficiency = (Work Output / Work Input) x 100%
**Give Your Answer As A Percentage**
Type answer...
9
Fill in the Blanks
If a machine has an efficiency of 40%, and you do 1000 J of work on the machine, what will be the work output of the machine?
Efficiency = (Work Output / Work Input) x 100%
**Include the units of Joules (J) in your answer**
Type answer...
Ch. 14.3
Mechanical Advantage and Efficiency
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