Block and Tackle - Demonstration Model
Product Number: SB42808
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Grades K-8. Each Demonstration Model measures approximately 2-1/2 times the size of the student version and is great for classroom demonstration. One pulley can be used to change the direction of the force applied by a cord. A small force on the cord can be use to lift a large weight. Experimenting with the device shows why lifting the block by a short distance requires that the cord be pulled a long distance. Includes a detailed activity guide which details the history of the model, practical applications, and classroom experiments. 31 in. x 9 in. x 5 in.