Final answer:
The swinging pendulum exhibits both kinetic and potential energy, with potential energy being highest at the endpoints of the swing and kinetic energy being highest in the middle.
Step-by-step explanation:
During the observation of a swinging pendulum from start to stop, the forms of energy that are likely to be related to your observations are kinetic and potential energy. At the moment the pendulum completes one cycle (point i) and just before it begins to fall back towards the other end, it has maximum potential energy and minimal kinetic energy. When the pendulum is in the middle between the two ends (point ii), it has maximum kinetic energy, as its speed is greatest here. Just before the pendulum reaches the end of one cycle (point iii), it is transitioning from kinetic back to potential energy.