1.

It is easier to roll a barrel full of coal tar than to pull it because_____

A. the full weight of the barrel comes into play when it is pulled
B. the rolling friction is much less than the sliding friction
C. more surface area of the barrel is in contact with the road when it is pulle
D. coal tar is a liquid and it flows in the barrel when it is rolled
Answer» C. more surface area of the barrel is in contact with the road when it is pulle


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