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A hockey puck slides across an ice rink more easily than it does across a rough concrete surface. Why is this?
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A hockey puck slides across an ice rink more easily than it does across a rough concrete surface. Why is this?

User Alexu
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2 Answers

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Becuase along the concrete, there is friction because it is not smooth.  The ice, on the other hand, is smooth and has much less friction. 
User Md Riadul Islam
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There is less friction between the ice and hockey puck. Concrete is generally more textured and rough, therefore creating more friction
User Doug Kimzey
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