Slippery surfaces are often...., Rough, Smooth, Grippy surfaces are often...., Rough, Smooth, Rough surfaces are often...., Grippy, Slippery , Smooth surfaces are often...., Grippy, Slippery , True or false? Rough surfaces are often more grippy., False, True, Which surface is more grippy?, , , Which surface is more grippy?, ice, concrete road, Which surface is more grippy?, Dry slide, water slide, Which surface is more slippery?, Carpet, Tiles, Which surface is more slippery?, Desk, Towel, Which surface would the marble roll further on?, Carpet, Tiles, Why would the marble roll further on the tiles?, Because the tiles are rough., Because the tiles are smooth, If there is more friction, do objects move faster or slower?, Slower, Faster, If there is less friction, do objects move faster or slower?, Slower, Faster.

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