Smooth things have low friction, True, False, Smooth things have high friction, True, False, Rough things have..., Low friction, High friction, BOILING, Smooth things have..., Low friction, High friction, Which one is more slippery?, Ceramic floor, Carpet, Water slide, Which one is rougher?, Bike tyre, Slide, Silk, The ball goes faster in..., Green playground, Bowling alley, Street, High friction makes..., Heat, Cold, Rubbing creates..., Friction, Cold, Low friction of the skate is..., Useful, Not useful

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