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9. Which of the following statements best describes friction?
a. It is a force that occurs between solids. b. It is a force that occurs only on rough surfaces. c. It is a force that occurs between solids and liquids. d. It is a force that occurs when surfaces touch each other.
10. How can you best reduce friction between the bottom or feet of furniture and the floor?
a. by smoothing the floor b. by keeping furniture on their place c. by applying lubricants like wax on the floor d. by putting wheels or rollers on the bottom or feet of furniture /*
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