PULLEY WORKSHEET
PULLEY WORKSHEET
PULLEY WORKSHEET
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Physical Science 233<br />
Name _______________________<br />
1 2 3 4 5 6 7 8<br />
<strong>PULLEY</strong> <strong>WORKSHEET</strong><br />
The mechanical advantage for a pulley system can be calculated similarly to the way it was calculated for the<br />
lever.<br />
AMA = R This equation is the same for all simple machines.<br />
E<br />
IMA can be calculated in 2 ways:<br />
1. IMA = ED ED is effort distance. This is the amount of string or rope that is<br />
RD<br />
pulled through a pulley system to raise the resistance.<br />
RD is resistance distance. This is the height that the resistance<br />
has been raised off the ground.<br />
2. The other way to find IMA is to count the number of supporting ropes or strands. See the<br />
example below. This pulley has an IMA of 4. The supporting<br />
strands are numbered.<br />
Example.<br />
below draw a pulley<br />
IMA of 2.<br />
In the space<br />
system with an<br />
Using the information above, answer these questions. Show your work!!<br />
1. George is using a pulley system (called a block and tackle) to lift the engine out of his car. The engine<br />
weighs 10000 Newtons but he only has to use a 400 Newton effort. What is the AMA of this system?<br />
2. George then takes some measurements. He finds that to lift the engine 5 m he had to pull 150 m of rope<br />
through his pulley system. What is the IMA of the system?
3. What causes the difference between AMA and IMA?<br />
4. As you do this problem, ignore friction. If we ignore friction, IMA = AMA. Show your work.<br />
a. What is the IMA of this pulley system?<br />
b. If you want to lift the resistance<br />
2 meters, how much rope would<br />
have to be pulled through<br />
the pulley system?<br />
c. If the resistance is 60 N, what effort<br />
force would be required to lift it?