The Case of the Powerful Pulleys Segment 4

The Case of the Powerful Pulleys Segment 4

A hand turns a handle to move two gearsDescription: The Treehouse Detectives finally have found the solution to lifting Jacob safely into the treehouse -- pulleys. However, they still don’t have an adequate number of pulleys to reduce the force sufficiently to make lifting Jacob easy for them, and they can’t figure out what to do with all that rope! They learn about gears, and the detectives think they have not only solved the problem of force, but that they have even solved the problem of too much rope. As Bianca wraps up her career day presentation, the Treehouse Detectives finish building their lift apparatus. Finally, they lift Jacob successfully into the treehouse! However, there is just one small problem …
 Audience: Educators
 Grade Level: 3-5
 Time Required: 2-3 days

 Objectives: Students will
      Determine how the number of teeth on a gear reduces the amount of force.
      Discover what materials are used to overcome friction.

Segment 4

Resources PDF Video
Video Component Description View [581KB]  
Video   Watch or Download
Description, Objectives and Vocabulary View [191KB]  
Get Your Gears Here View [126KB]  
Fighting Force of Friction View [125KB]  
Simply Words View [72KB]  
Answer Key View [405KB]  

This segment is a part of The Case of the Powerful Pulleys Unit.
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Page Last Updated: January 8th, 2014
Page Editor: NASA Administrator