Final answer:
The kettlebell swing is an example of energy transformation, where potential energy is converted into kinetic energy as the kettlebell moves upwards, and vice versa as it comes back down. This is similar to a child on a swing set, where potential and kinetic energy are interchanged during the course of the swing.
Step-by-step explanation:
The correct swing phase of a kettlebell swing involves the transformation of potential energy (PE) to kinetic energy (KE) and vice versa. At the start of the swing, the kettlebell has maximum potential energy when it is stationary at the lowest point. As the kettlebell is swung upward, the potential energy is converted into kinetic energy, reaching maximum kinetic energy when the kettlebell is at the apex of the swing. As the kettlebell descends, kinetic energy is transformed back into potential energy.
In the context of a pendulum, which can be compared to a child swinging on a swing set, potential and kinetic energy are continually being interchanged. At the highest points of the swing, the potential energy is at its maximum and kinetic energy is at its minimum. As the pendulum or swing moves downwards, potential energy decreases while kinetic energy increases and this process repeats throughout the swing.