Product Type: Educator Guide, Lesson Plan/Activity, Video Learning Clip
Grade Levels: 3-5
Publication Year: 2002
Product Number: EG-2002-07-12-LARC
Subjects: General Science: Energy, Heat, and Magnetism; Forces and Motion
Time Required: 2-3 days
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 …
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.
NASA SCI Files -- The Case of the Powerful Pulleys Segment 4
Video Component Description [581KB]
Watch NASA SCI Files -- The Case of the Powerful Pulleys Segment 4
Download NASA SCI Files -- The Case of the Powerful Pulleys Segment 4
Video Duration: 14 minutes, 16 seconds
Video File Size: 165 MB
Segment 4 Description, Objectives and Vocabulary [191KB]
Get Your Gears Here [126KB]
Fighting Force of Friction [125KB]
Simply Words [72KB]
Answer Key [405KB]
This segment is a part of The Case of the Powerful Pulleys Unit.
› View Unit
Need help with downloading the video? Try this.
Click Control or right click on the Download video link.
Select either the Save Target As or Save Link As option.
Select where you want to save the video on your computer, and save the video.
The video will show in the player that is loaded on your computer, such as QuickTime, iTunes, etc.