Lesson 3.2: Fixed and Moveable Pulleys
Lesson 3.2: Fixed and Moveable Pulleys |
View the following two movies "Pulley Power" and "Two Pulley Systems".
A fixed pulley does not mean one that has been repaired. It means a pulley that is attached to an immovable surface. The pulleys on a clothesline are attached to the house and a pole and are fixed pulleys. A moveable pulley is one that moves with the load and is attached to the load in some way.
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Read "Fixed and Moveable Pulleys" on page 142 of your textbook. |
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Answer the following self-check questions. |
| Question 1. |
How many fixed pulleys are there in each of the parts of the investigation on pages 140 and 141?
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| Question 2. |
How many moveable pulleys are there in each of the parts of the investigation on pages 140 and 141?
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| Question 3. |
How many pulleys are there in the picture below?
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The term block was mentioned in the title on page 140 but was never discussed. A block is the term used to describe a series of pulleys all connected in a group. The picture under "Analyze" on page 141 is a picture of a block that has 5 or 6 working pulleys in it.
Coral Castle was built by a very small man (he weighed 100 pounds). How he managed to lift massive blocks of coral by himself was hidden in mystery. To see how he cleverly used simple machines to build his castle, go to this website:
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