Students learned about the three classes of levers and how manipulating their components can lessen the effort or force needed to move an item. Above, Riley K. is demonstrating a first class lever, how a bag of books requires less effort to lift if his shoulder (the fulcrum) is closer to the load. He is also trying very hard to support the load when the fulcrum is far away from the load. It's tough! I demonstrated a third class lever with the example of a broom and a hockey stick. If you place your hand in the middle, you get a good balance of control and effort needed. Students then recalled the three types of levers in a little race, learning that the middle component of each type of lever is different.
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" |