What usually causes a locked wheel skid?
Braking too hard at a slow speed
Braking lightly at a slow speed
Braking too hard at a fast speed
The Correct Answer and Explanation is :
The correct answer is:
Braking too hard at a fast speed
Explanation:
A locked wheel skid occurs when a vehicle’s wheels stop rotating while the vehicle is still moving, causing a loss of traction and control. This typically happens under the following conditions:
- Braking too hard at high speeds: When brakes are applied with excessive force, especially on slippery surfaces, the wheels may stop turning entirely. This sudden halt of wheel rotation prevents the tires from gripping the road surface effectively, leading to a skid.
- Road Conditions: Wet, icy, or gravelly roads reduce the friction between the tires and the road. When braking hard in such conditions, the likelihood of the wheels locking up increases.
- Improper Vehicle Control: Drivers may panic and slam on the brakes in emergencies, causing the braking force to exceed the tires’ grip capacity. This abrupt force is especially problematic at higher speeds because the momentum of the vehicle magnifies the effects of a locked wheel.
Why is it Dangerous?
- Loss of Steering Control: Locked wheels do not allow the driver to steer because the tires are no longer rolling and maintaining friction with the road. This makes it impossible to avoid obstacles or navigate curves.
- Longer Stopping Distance: Skidding tires take longer to stop than rolling tires, as the friction generated in a skid is less efficient than controlled braking.
How to Prevent It:
- Use Anti-lock Braking Systems (ABS) if equipped. ABS prevents wheels from locking by modulating brake pressure during hard braking.
- Apply brakes smoothly and gradually, especially in adverse weather conditions.
- Maintain a safe speed and following distance to allow time for controlled braking.
Understanding these dynamics helps drivers maintain control and stay safe on the road.