4. In some cases, too much friction prevents movements, so, there is a need to A. increase friction B. maintain friction C. decrease friction D. none of the above 5. If you run down the sidewalk and stop quickly, you can stop because of the between your shoes and the cement. A. gravity B. motion C. friction D. heat
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Answer:
4. C
5. C
Explanation:
Friction is greater on rough surfaces than on smooth surfaces