$Assertion$ : Mountain roads rarely go straight up the slope.
$Reason$ : Slope of mountains are large, therefore more chances of vehicle to slip from roads
$Reason$ : Slope of mountains are large, therefore more chances of vehicle to slip from roads
AIIMS 2016, Easy
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Both Assertion and Reason are true and Reason is the correct explanation of Assertion. If roads of the mountain were to go straight up, the slope $\left( \theta \right)$ would have been large, the frictional force $\left( {\mu mg\,\cos \,\theta } \right)$ would be small. Due to small friction, wheels of vehicle would slip. Also for going up a large slope, a greater power shall be required.
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