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All of the following can reduce friction except a. concrete b. oil c. grease d. water​
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All of the following can reduce friction except a. concrete b. oil c. grease d. water​

User Joshua McCarthy
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Answer: A, concrete. Concrete when wet may provide little to no moisture but when hardened, it becomes a chalky and heavy substance. Therefore, concrete does not reduce friction.
User Edward Newell
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