What main forces can cause a vehicle to skid?

The main forces that can cause a vehicle to skid involve excessive braking, harsh acceleration, and coarse steering. When a driver applies the brakes too hard, it can lead to a loss of traction, especially on wet or slippery surfaces, resulting in the vehicle skidding. Harsh acceleration can also cause the wheels to spin out instead of gaining grip on the road, leading to a skid. Similarly, coarse steering maneuvers can disrupt the balance of the vehicle, particularly if they are made suddenly or without control, which can shift the weight and destabilize the vehicle, causing it to lose traction and skid.

This phenomenon is less likely to occur at regular speeds with gradual turning, as these actions generally maintain adequate traction and control over the vehicle. Wind resistance and tire pressure are also less directly linked to skidding; while they can affect overall vehicle handling, they do not directly produce the skidding effect that results from more aggressive driving behaviors like those described in the correct answer.