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Roofing

konneroakes

Entry posted by konneroakes

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While I was roofing over the summer with my dad he would put bundles of shingles up on the asphalt roof. The angle of the roof was about 30 degrees. Friction was keeping the bundles of shingles on the roof. However if they were touched just a little they would slide down the roof a little. If I create a free-body diagram of the bundle of shingles on the roof I find that FNet=mg so Ff- mgsin<=0 so Friction=mg< and the normal force is FN= mgcos<. To find friction coeff. of friction= mgsin</mgcos< so the coefficient of friction was equal to tan<. The angle was 30 degrees so tan30 = .577. Ther coefficient of static friction for the bundle of shingles on the roof was .577.

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