Slippery and rough
Things slide easily on smooth, icy ground and hardly at all on rough ground: that rubbing is called friction.
Depth 1 · Foundation
You can say which surfaces are slippery and why we walk carefully on ice.
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Foundation
You can say which surfaces are slippery and why we walk carefully on ice.
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What's still between you and Slippery and rough, depth 1, in the order you can learn it.
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