Practice Quiz

NAEP Science Grade 8

Category - Science

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Kelly slides a flat rock across the smooth ice of a frozen pond. The rock slows down after several seconds. What causes the rock to slow down?
  1. The thickness of the ice
  2. The temperature of the air above the ice
  3. The force of friction between the ice and the rock
  4. The gravitational force between the ice and the rock
Explanation
Answer: C - The force of friction between the ice and the rock.
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