Question

Why do roads leading to the top of a mountain wind back and forth

Answer 1

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To reduce risk of slipping by increasing friction between tyres and road. while going up a mountain the opposing frictional force F=μN=mgcosθF=μN=mgcos⁡θ where θθ is the angle of slope with horizontal .To avoid skidding FF should be large,so cosθcos⁡θ should be large and hence θθ should be small.so roads are made winding upwards.the road straight up would have larger slope.

Answer 2

Answer:

the road leading to the top of mountain wind back and forth in order to reduce the slipping possibility there by increasing the power ln winding back and forth of the road the angle of inclination remain decrease there force consuming less amount of power