Question

where do we have more friction on sand or tar road?

Answer 1

We have more friction in sand than in tar road. 
Hope this helps you!

Answer 2

We have more friction on sand  than tar road , it is because since  friction between sand and feet is less than that between concrete and feet and also due to  lithology of sand it has more contact forces upon feet .

Hope it will help u .....

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Best of luck ;)
ROYALJATT