Answer:
A small metallic ball (called bob) suspended by a light string (thread) from a frictionless, rigid support is called a simple pendulum. A simple pendulum is shown in figure alongside.
The bob of a simple pendulum swings from one extreme position to the other through its mean position. The bob is at its highest position at the extreme positions and at lowest at its mean position,
The energy changes which occur during the motion ot the bob are shown in figure given alongside. So, when a pendulum swings to and fro, its energy changes constantly.
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