Question

Roads on the hills are made winding.Explain why?

Answer 1

Either way, by making vehicles go up a longer, but less steep slope, the vehicle has to exert less power to do so. The idea is that it's easier to exert less power over a longer period of time. Also, going down those steep slopes may cause more accidents than the winding  road.

Answer 2

power. Most vehicles don't have the ability to exert enough force fast enough to climb up a steep slope like that. Or, if they do have enough power, they don't have enough gasoline to do that again and again. Either way, by making vehicles go up a longer, but less steep slope, the vehicle has to exert less power to do so. The idea is that it's easier to exert less power over a longer period of time.

Also, going down those steep slopes may cause more accidents than the winding mountain road. It would be too steep to rely on engine brakes, so you'd have to use your disk brakes more, which could result in more burnt-out brakes