In: Physics
Cars have spoilers to increase their grip on the road.
Normally the weight of a car is the only thing that forces the tires down onto the pavement. Without spoilers, the only way to increase the grip would be to increase the weight, or to change the material of the tire.The only problem with increasing the weight is that it doesn't help in turns, where you really want to grip. All that extra weight has inertia, which you have to overcome to turn, so increasing the weight doesn't help at all. The way the spoiler works is like an airplane wing, but in reverse way. The spoiler actually generates what's called 'down force' on the body of the car.
in airoplane wings in upper side length is more so air has to
travel with higher velocity and because of bernoulli's relation we
can see that due to this pressure decreases this given a net upward
force to the airoplane in case of spoilers exactly opposite
happens.