How does a mobile vibrate?

How does a mobile vibrate?There is a little motor fitted in a cell phone. This motor has unbalanced weight, in other words, is unevenly weighted on its output shaft. When this motor rotates, the rotating uneven weight causes the mobile to vibrate. A similar mechanism is also present in gaming devices such as the play station.

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World Lupus Day is dedicated to people worldwide who suffer from this debilitating autoimmune disease …