Question

suggest way to increase friction of a slippery floor
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Answer 1

Answer:

Some grooves have been made in the Soles by the makers of shoes. The grooves are made in the soles of shoes to increase friction with the ground so that the shoes get a better grip even on a slippery ground and we can walk safely. When a road is wet, there is a layer of water on the roads

Answer 2

Answer:

adding sand and gravel to a slippery road makes it less slippery.

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