
Nothing to it with William Gurstelle's "Backyard Ballistics," a soft-cover, 169pp compendium by an engineer on constructing rockets, cannons (carbide and spud), flingers, tennis ball mortars, balloons, fire kites, and other intriguing devices, all with common household materials. The detailed text includes parts lists, illustrated instructions, photos and quite sensible and necessary safety precautions. From Chicago Review Press.
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92823 BACKYARD BALLISTICS |
WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 yrs.
Physics starts here. Thames & Kosmos makes this dandy little kit to build models of all six simple machines: levers, pulleys, inclined planes, screws, wedges and wheels & axles, along with a spring scale to measure forces. You add a plastic pop bottle for weight. For ages 8 and up.
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94287 SIMPLE MACHINES KIT |
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