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 Printable Version
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Title - Simple Machines Unit Lesson 8
By - Debbie Haren
Subject - Math, Science, Social Studies, Language Arts
Grade Level - 3/4
Simple Machines Unit Lesson 8:
Questions:
How does a pulley help us do work?
A pulley is a simple machine that uses grooved wheels and a rope to raise or lower a load. How can a flag move up and down a flagpole? Lets try it using a milk jug and a pulley and some rope.
Task:
Have students lift a milk jug with some dirt in it just attached to a rope. Have them write in their journal what that was like. Then have the students use a fixed pulley to move the jug. Have them write if that was easier or harder. Then have the students use a movable pulley. Have them write about that.
Discussion:
Which try took the least force?
Which try took the most force?
Conclusion:
Which pulley would you use to move a load? Why?
How does a pulley help us work?
Also the teacher can take students outside and observe the actual flag at their school being taken down and see a real pulley in action.
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