What Occurs When You Put a Rock in a Laundry Machine? Putting a rock in a washing machine can cause serious damage. The heavy, hard object disrupts the machine’s balance during high-speed spinning, leading to violent shaking. This imbalance can break internal parts, damage the drum, or even destroy the machine, resulting in costly repairs or the need for replacement. Credits: @GineersNow @bootsowen | Guppy News