Pulley Systems: Ideal Mechanical Advantage & Efficiency

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Homework Statement

1. How does increasing the load affect the ideal mechanical advantage and efficiency of a pulley system?

2. How does increasing the number of pulleys affect the ideal mechanical advantage and efficiency of a pulley system?

The Attempt at a Solution

My data is all messed up for this lab so just using logic for number 1 I am inferring that for both it would go down due to the increased amount of friction. And for 2 I would say it makes it more efficient, Please verify!

 

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could someone take a look at that link and also verify the amount or number of lifting strands on each set up. My lab group put different stuff down then what I think it is. Personally i think A is 1, B is 2, not sure about C or D

 

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I need a good grade but here's what i think, As you increase the load the IMA and efficiency both decrease. The problem with my data is the efficiency decreases but the IMA increases..why?

Increasing the number of pulleys increases both the IMA and efficiency, I am def sure about that

And for the number of strands I read on the lab its the number of strings used to the support the load

a- definitely 1

b- has 2

c- has 2

d- has 4

 

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Come on guys, this seems easy, i just want to have a little more confidence with my answers