When playing a game of pool, your first shot of the game is called a "break" where the colored pool balls that were previously racked together in a stationary position on the table, collide with a cue ball sending them all over the table.
What changed when the cue ball collided with the colored balls?
What caused the colored pool balls to speed across the table in all different directions?
The man is playing an electric guitar.
What do you observe in the picture that could be energy?
How do you know that this energy is being transferred from one place to another?