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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 [Wrong Answer] |
B. | the rolling friction is much less than the sliding friction [Correct Answer] |
C. | more surface area of the barrel is in contact with the road when it is pulled [Wrong Answer] |
D. | coal tar is a liquid and it flows in the barrel when it is rolled [Wrong Answer] |