#22 Machines (grades 7-12)

Soft-bound, 48 page book, 16 reproducible task cards, full teaching notes. Employ the TOPS advantage: build fun stuff with simple things. Devise levers, pulleys, reinvent the wheel, check gear ratios, calculate horsepower, win a tug-of-war. Use spring scales to weigh loads, measure effort, and calculate efficiency. Discover that machines save effort, but never reduce work! Download a Preview here Download a Free Sample Lab here More Information – click any of the tabs below to learn more about this title Get Materials Click here for a complete list of materials and convenient shopping. meter sticks, rubber stoppers, masking tape, rulers, centimeters or inches, baby food jars with tight-fitting lids, thread, spring scales, plastic wrap, scissors, paper clips, pulleys, straws, paper punch tools, cardboard, index cards,  staplers, bolts, can opener, nut cracker, broom, wire, about 14 gauge, strong smooth post, fixed upright, cord or rope, cans, rubber bands, small lids from cookin