Mechanical Advantage of Pulleys - Laboratory Worksheet

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Variables:
 P = Load (number of pennies) P(actual) = Actual Load P(calc.) = Calculated Load N = Number of Ropes (Mechanical Advantage) P = Pa x N F = Friction F = Pa - P(calc.)

Data Table 1:
NPP(actual)P(calc.)F
1
20
...
1
40
...
1
60
...
2
20
...
2
40
...
2
60
...
4
20
...
4
40
...
4
60
...
6
20
...
6
40
...
6
60
...

Data Table 2:
NPLift DistancePaPull Distance
1
....
2
....
4
....
6
....

Questions:

1. Is there any change in the amount of friction as the pulley setup uses more pulleys?
2. What is the relationship between the distance of rope pulled at (P) versus the amount of distance (Pa) moves?
3. What would require more work, lifting a sixty-pound load one-foot or a ten-pound load six feet?
4. Based on the results of this test, how will this concept influence your design? Please explain.