MCQOPTIONS
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MCQOPTIONS
| 1. |
It is easier to roll a barrel full of coal tar than to pull it because _________________ |
| A. | the rolling friction is much less than the sliding friction |
| B. | coal tar is a liquid and it flows in the barrel when it is rolled |
| C. | more surface area of the barrel is in contact with the road when it is pulled |
| D. | the full weight of the barrel comes into play when it is pulled |
| Answer» B. coal tar is a liquid and it flows in the barrel when it is rolled | |