Final answer:
The main objective of practicing turns around a point is to maintain stability and balance during a turn on level ground. The correct angle of leaning ensures the force of the ground on the wheel aligns with the center of gravity, while the horizontal component of the force provides the centripetal force needed.
Step-by-step explanation:
The main objective for practicing turns around a point is to ensure stability and maintain balance while making a turn on level ground.
When a bicyclist leans at the correct angle, the force of the ground on the wheel allows for a line through the center of gravity, ensuring stability.
The net external force acting on the system is the centripetal force, which can be achieved by resolving the force on the wheel into its horizontal and vertical components.