Simple Machine: Wood Block & Tackle Model

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One pulley can be used to change the direction of the force applied by a cord several pulleys can be used to make this simple machine. A small force on the cord can be used 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. L: 13.38" W: 4.25" H: 6.63" Ages 3+ Brand: Learning Advantage Show more