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Learn how pulleys can be used to transfer force with reduced friction and how to increase force or speed at amazing levels. Build 7 working models including a stationary bike, a construction crane, a crane bridge, a moving bridge, a material lift, a windmill and a blender. A 36 page activity book is included with innovative experiments and detailed explanations of the different technological principles applied! A booklet with detailed building instructions is also included.

$ 39.99

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