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Work, Energy, and Power — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsWork, Energy, and Power1 Mark
Question
Moutain roads rarely go straight up but wind up gradually. Why?
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Answer

Frictional force f is given by $\text{f}=\mu\text{mg}\cos\theta$. If the roads go straight up the angle of slope $\theta$ would be large and frictional force will be less and vehicles may slip.

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