Tuning fork and sound waves
By To demonstrate that sound is produced by vibrations.
Use tape to fix a string to a small plastic ball. Suspend the ball from a support. Now, strike a prong of a tuning fork against a pad, and touch the ball with the prong. The ball will move away with a jerk. This shows that the prongs are vibrating. When they vibrate, they move back and forth. So, when a vibrating prong touches the ball, the ball moves.
Gently touch the surface of the water kept in vessel with a prong of a tuning fork, after striking it against a pad. Since the prong vibrates, it creates ripple in water.
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