Learning Exercise

What Class Are You In ? (Levers)

Students will again learn about levers with human examples. Students will also watch a video on the Skeletal System (Schlessinger Science Library)
Course: 7th grade Life Science

Excellent graphics of the skeletal system , and individual bones. see more


What Class Are You In?
Your skeletal and muscular systems work together to move your body parts. Together the two systems work like a simple machine called a lever. A lever is defined as a bar that is used to lift weight. The bar of the lever moves on a fixed point called the fulcrum. There are three classes of levers.
Students will now watch the video and answer the following:
1. First Class Lever
Draw and explain how a first class lever works. Give a human example. 2. Second Class Lever
Draw and explain a second class lever. Give a human example. 3. Third Class Lever
Draw and explain how a third class lver works, give a human example.



Cell Biology. Organization of the body. Musculoskeletal System.


Levers in the Human body. Video covers the value of the skeletal system. BOnes, types of muscle, how joints work with the help of connective tissues like cartilage, ligaments and tendons.

Learning Objectives

Students know how to compare joints in the body with structures used in machines ans simple devices. (6.h) Students be able to explain how levers confer mechanical advantage and how the application of this principle applies to the musculoskeletal system. (6.i)


See Muscle System