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Top-quality latex-free erasers remove marks completely without smudging
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and sprigs can be arranged in countless ways to accommodate both large and small displays
Synthesis * Compact size saves space on the shelf and in the classroom * High-interest graphics and content * Short passages allow time for full comprehension and the chance to read a variety of topics * Winning is based on knowledge and skills
Simple Machines Block & Tackle Woodland Friends Top-quality latex-free erasers remove marksMPN: 005646 UPC: 895452001480 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. This classic wooden model offers children a basic concept of the laws of physics. Desktop sized.
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