Final answer:
When stopping quickly while turning, it is best to apply both brakes simultaneously on a motorcycle.
Step-by-step explanation:
When turning a motorcycle, it is ideal to straighten the motorcycle first before applying the brakes. However, if you must stop quickly while turning and are unable to straighten the motorcycle, it is best to apply both brakes simultaneously.
By applying both brakes, you distribute the braking force between the front and rear wheels, which helps in maintaining stability and control during the stop.
If you were to use only the front or rear brakes, there could be a risk of the motorcycle tipping over or losing control due to the imbalance in braking forces.