Final answer:
When the drive wheels of a vehicle start to spin, you should ease off the accelerator to allow the wheels to regain traction. The situation is dictated by static and kinetic friction, where you need to reduce the power until the force falls below the static friction threshold for control.
Step-by-step explanation:
When you apply power to the drive wheels of a vehicle and they start to spin, it indicates that the wheels have lost traction with the road surface, typically due to excessive acceleration or slippery conditions.
The correct action to take is to ease off the accelerator immediately to allow the wheels to regain traction. Spinning wheels can lead to a loss of control, especially if the vehicle begins to slide.
This situation is a matter of understanding static and kinetic friction. Static friction is the force that prevents the tires from slipping as you start to accelerate.
If the force of the engine on the wheels (through the powertrain) exceeds the static friction threshold, the wheels will begin to spin, and kinetic friction takes over. Kinetic friction is lower than static friction, which is why the wheels continue to spin rather than grip the road.
Regaining traction involves reducing the force being applied until it drops below the static friction threshold again. In wet or icy conditions, being gentle with the acceleration can be critical. This same principle applies when braking; easing off the brake before completely stopping prevents the tires from locking up and skidding, ensuring a smoother stop.