Contains everything needed to observe the frictional force of 4 different surfaces: rubber, cork, sandpaper and cardboard. Includes 7" x 12" surface board, 2 wooden blocks with hooks and instructions. The blocks are 3” x 2” x 1/2” and weigh about 41 grams each. (Order a spring scale if you wish to measure the frictional forces.)
NOTE: Actual product may vary from the one pictured due to differences in suppliers.
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