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Mountain roads rarely go straight up the slope but wind up gradually. Explain why.
In the straight up situation, the angle of inclination is more than the wind up situation. When mountain roads go wind up, the slope will be less than when the roads go straight up. So the frictional force is very large when the road winds up. So the tire of the vehicle will not slip easily when the roads go wind up. Another thing is that, in the straight up situation due to the large angle of inclination you have to work more to go up against your gravity, but when the roads are wind up due to the small angle of inclination you have to work less to go up against your gravity. That is why mountain roads rarely go straight up the slope but wind up gradually.
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