1. Which has the least friction? A. gravity B. friction C. motion D. shoes 2. What are you going to put in a surface to reduce friction? A. stone C. piece of cloth B. lubricant D. none of the above 3. Which shows that more friction is useful? A. Wheels of cars has jagged B. slides have smooth surfaces C. heavy cabinets have rollers D. sports shoes have lesser spikes some
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Answer:
1. C
2.A
3. A
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