Question

Why are mountain roads generally made sliding upwards rather than going straight up?​

Answer 1

Answer:  Roads are made winding upwards rather than going straight to make the frictional force large to avoid the skidding of vehicles. Force of friction, when road makes an angle  θ  with the horizontal =μmgcosθ. 1f θ=90o, then force of friction = 0 and there is a great chance of the skidding of vehicles. OR If roads are straight, large force is needed by the vehicle to move up

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