A machine applies a force of 100N over a distance of 10 m to raise a 500N drum 1.5 m?

Question

a. What is the work input?

b. What is the MA of the machine?

c. What is the work output?

d. What is the efficiency of the machine?

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My teacher, fails at teaching.
I would like to be able to understand how to solve this before our test :]
Please.

Answer 1

Work is product of the force applied and the distance along which the object has been moved by that force. The keys are (along or parallel!)


a. W(in)=Fs= 100x10=1000 J

b. Mechanical advantage
MA= Effort out/Effort in=500/100= 5:1

c. W(out)= w h= 500 x1.5= 750J

d. Efficiency= W(out)/W(in)= 750/1000= .75
or 75%

I hope it helps

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