VIBRATIONS NATURAL VIBRATIONS DAMPED VIBRATIONS FORCED VIBRATIONS.

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Presentation transcript:

VIBRATIONS NATURAL VIBRATIONS DAMPED VIBRATIONS FORCED VIBRATIONS

NATURAL VIBRATIONS : PERIODIC VIBRATIONS IN THE ABSENCE OF ANY EXTERNAL FORCE REMEMBER: THESE VIBRATIONS CAN OCCUR ONLY IN VACUUM!!!!!!! ONLY ONE FORCE IS ACTING: RESTORING FORCE

DAMPED VIBRATION: PERIODIC VIBRATIONS OF A BODY OF DECREASING AMPLITUDE IN THE PRESENCE OF A RESISTIVE FORCE TWO FORCES ACT ON THE BODY – RESTORING FORCE AND FRICTIONAL FORCE

FORCED VIBRATION: VIBRATIONS OF A BODY TAKING PLACE DUE TO AN EXTERNAL PERIODIC FORCE THREE FORCES ACT ON THE BODY – RESTORING FORCE, FRICTIONAL FORCE AND THE EXTERNAL PERIODIC FORCE

RESONANCE : WHEN THE FREQUENCY OF THE APPLIED FORCE IS EQUAL TO ITS NATURAL FREQUENCY, THE BODY VIBRATES WITH AN INCREASED AMPLITUDE

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