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Learning Exercise

Material: Skeletal System
Submitted by: sepalika wickremasinghe on Dec 11, 2007
Date Last Modified: Dec 11, 2007
Title: What Class Are You In ? (Levers)
Description: Students will again learn about levers with human examples. Students will also watch a video on the Skeletal System (Schlessinger Science Library)
Type of Task: Supplemental Activity, Teacher-centered
Time Required 38 minutes
Topics: 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.
Course: 7th grade Life Science
Audience: Middle School
Prerequisites Skills: Cell Biology. Organization of the body. Musculoskeletal System.
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)
Text of Learning Exercise: 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.
Assessment: See Muscle System
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