Smooth-edged wheels are often made of rubber so they grip each other. Moving the driver wheel makes the driven wheel turn the opposite direction. | Belt or chain system moves both wheels the same direction | Gears align their notches to stay connected. Moving the driver wheel makes the driven wheel turn the opposite direction. |
The wheel and axle simple machine exists in model vehicles, pulley systems and gear systems. Students completed a craft that helped them visualize how a gear moves. They learned that when one gear moves, the one the moves because of it will move in the opposite direction! Then we moved on to learn about the different drive systems that exist, using the wheel and axle. Students made their own drive system using gears and tested out how making the larger or the smaller wheel the driver affects the other wheel. For example, if the large wheel is the driver, rotating it around one full turn makes the driven wheel rotate more than two full turns!
0 Comments
Leave a Reply. |
Home Reading
300 minutes a month (approx. 10 min. per night) Word Work (due Wed.)
Archives
June 2017
Categories
All
"Observe and reflect, and become a little wiser every day" |