why do roads are bent around the corners?

Question

it is related to every day science . Maybe centripetal or centrifugal force has something to do with it

Answer 1

The above answer is correct. The physics behind banking is simple. Centripetal force (side force needed to keep the car turning in a circle) is mv^2/r, where m is mass, v is velocity and r is turn radius. This force can be obtained from gravity, by banking the road. The amount of the gravitational side force Fg is m*g*sin(theta), where theta is the bank angle in radians. Thus knowing the desired v and r, you want theta such that v^2/r = g*sin(theta). With this equality, vehicles will experience no apparent sideslip force. Note the m cancels out; the bank angle will work for any mass vehicle.
So suppose you are building a road and have a curve with a 300 m radius which you want drivers to be able to negotiate at 30 m/s. Then theta = arcsin(v^2/(rg)) = .3109 rad = 17.81 deg.

Answer 2

To be precise, there is no such thing as centripetal or centrifugal force. They are what is know as "fictitious" forces.

The correct way to picture it is as follows. When you are accelerating, your car wants to go straight forward and not around the bend. This can be corrected in two ways: you could just turn the wheel and take the corner OR you could build the road with a "bank" (or "bend") so that your car will be pulled into the turn through the force of gravity.

Answer 3

As a car goes around a corner, it's momentum tries to keep it going in a straight line. This can be thought of as a force pulling sideways on the car. If you tilt the road (and the car) part of this force gets directed into the road which helps keep the car from slipping off the road

Answer 4

I think you mean 'banked' and not 'bent'. And yes, it's to help counteract the centrifugal force experienced as an auto rounds a corner by adding a centripital component of force.


Doug

Answer 5

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Answer 6

so it doen't go over othe peoples properties , face it it would be boring driving straight.

Answer 7

roads have corners?