Figure CQ10.15 shows a side view of a childs tricyclewith rubber tires on a horizontal

Chapter 10, Problem 15

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Figure CQ10.15 shows a side view of a childs tricyclewith rubber tires on a horizontal concrete sidewalk.If a string were attached to the upper pedal on the far side and pulled forward horizontally, the tricyclewould start to roll forward. (a) Instead, assume a stringis attached to the lower pedal on the near side andpulled forward horizontally as shown by A. Will the tricyclestart to roll? If so, which way? Answer the samequestions if (b) the string is pulled forward and upwardas shown by B, (c) if the string is pulled straight downas shown by C, and (d) if the string is pulled forwardand downward as shown by D. (e) What If? Supposethe string is instead attached to the rim of the frontwheel and pulled upward and backward as shown by E.Which way does the tricycle roll? (f) Explain a patternof reasoning, based on the figure, that makes it easy toanswer questions such as these. What physical quantitymust you evaluate?

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