Why are pushes given to a playground swing more effective if they are given at certain regular intervals than if they are given at random positions in the swing's cycle?

Pushes given to a playground swing at regular intervals align with the swing's natural oscillation frequency, maximizing energy transfer. This synchronization allows each push to add energy to the swing's motion, resulting in higher amplitude swings. In contrast, random pushes can disrupt the swing's rhythm, leading to less effective energy transfer and diminished height. Timing the pushes ensures that each one contributes optimally to the swing's movement.