Because of g force and gravity
They are flaps on the back, mostly meant for race cars but people like the look of them on their cars. They are designed for high speeds. The air hits the spoiler and pushes down on it, pressing on the rear of the car. This prevents the back end from actually lifting up at high speeds.
no
Your average car can reach speeds of up to 230km\h. The highest speed reached ever by a car is 413km\h.
Impulse
A car that is jerking at high speeds probably needs a tune-up. Barring any major mechanical issue, this will solve the problem.
Speeds up, slows down or goes round corners.
Probably in need of a complete tune up.
It is a really nice fast and expensive car no it can reach speeds up to 300 mph!!!!
A lot of power is required to go up the hill. In some vehicles, the A/C is turned off to conserve the power for motion. When you get to the top, it will kick back in at the higher speeds.
Don't back up a hill, drive up it.
Idle compenstorVehicles hve an idle copensator that speeds up the engine when the ac is turned on to ring the rpm back up to the proper idle speed, if yours is too fast then t needs to be adjsted.
Parts tend to loosen up in the car, and like anything else when cruising at fast speeds it intensifies the motion, hence the vibration.