Final answer:
The turning point of an object is the moment when it completes one cycle and begins to fall back towards the other end.
Step-by-step explanation:
The turning point of an object is defined as the moment when it completes one cycle, just before it begins to fall back towards the other end. This can be seen in the motion of a pendulum or a mass on a spring.
In the case of a pendulum, the turning point is reached when the pendulum reaches its highest point and changes direction to swing back down.
Similarly, in the case of a mass on a spring, the turning point is reached when the mass reaches its maximum displacement from the equilibrium position and starts moving back towards the equilibrium position.