If you're seeing this message, it means we're having trouble loading external resources for Khan Academy.

If you're behind a web filter, please make sure that the domain *.kastatic.org is unblocked.

PLEASE NOTE: Some of the videos in this section are silent to allow the viewer to make their own observations about what is happening and respond to the questions posted below. 

This video has no sound. 

1. Which gondola has the greater mechanical advantage when the one on the left is moved closer to  the axle of the "wheel"? Why? 

2. Where is the out side edge of the "wheel" for the gondola on the left after it is moved? 

3.  Why do the straight LEGO pieces attached to the gear point at different angles when the gondola on the left is moved?