Vibration Aris Ok
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VIBRATION
Aries Triwidajati S. S.Pd SMP Negeri 2 Cileunyi Bandung [email protected]
BASIC COMPETENCE
Describe the vibration and the wave concept and their parameters
Lear nin g Ob je ctiv es Students are able to: 3. Explain the concept of vibration by connecting relevant nature phenomenon. 4. Measure the period and frequency of a vibration of something hung with a rope or spring 5. Use the concept and principle of vibration to calculate the frequency or period. (Using T = 1/f or f = 1/T)
KEY WORD S 1. 2. 3. 4.
VIBRATION FREQUENCY PERIOD AMPLITUDE
150
EXAMPLE: IF THE PENDULUM IS PULLED TO 150, WHAT WILL HAPPEN ?
150
150
B
A O
POINT A : INITIAL POINT POINT B : FINAL POINT POINT O : EQUILIBRIUM
ONE VIBRATION IS DEFINED AS ONE CLOSED TRACK, MEANING THE TRACK OF A MOVEMENT COMING BACK TO ITS ORGINAL PLACE (INITIAL POINT).
B
O
A
QUESTION A. START FROM A B. START FROM B
B
O
A
FINAL INITIALPOINT POINT Point A = ………………………. EQUILIBRIUM Point O = ………………………. FINAL POINT INITIAL POINT Point B = ………………………. B –– O O A A quarter vibration = ……………………….
A half vibration
B –– O O -- B A = A……………………….
A one vibration
A –– O O –– A B –– O O -- B A = B……………………….
PERIOD PERIOD IS THE TIME NEEDED FOR ONE VIBRATION
PERIOD IS SYMBOLIZED BY T. PERIOD IS COUNTED IN SECONDS.
FREQUENCY FREQUENCY IS THE NUMBER OF VIBRATIONS HAPPENING IN EVERY SECOND. THE UNIT OF FREQUENCY ( f ) IS 1 / SECOND, WHICH IS ALSO CALLED ONE HERTZ OR Hz. A FREQUENCY OF 1.000 HERZT IS ALSO CALLED 1 KILOHERTZ OR 1 kHz.
THE RELATION BETWEEN THE FREQUENCY AND PERIOD OF VIBRATION IS f = 1/T OR T = 1/f
EXAMPLE : ACCORDING TO THE FIGURE BELOW, IF IN ITS MOTION PASSING THROUGH POINTS A – O – B – O – A THE PENDULUM NEEDS 20 SECONDS, THE FREQUENCY OF THE VIBRATION OF THE SWING IS 0.05 _____HERTZ
B O A
Known : Vibration = 1 Time = 20 S Asked : f ………? Answered: f = vibration/time = 1/20 = 0.05 hertz
CONCLUSION VIBRATION IS AN OSCILLATION MOVEMENT THROUGH A POINT OF EQUILIBRIUM. PERIOD IS THE TIME NEEDED FOR ONE VIBRATION FREQUENCY IS THE NUMBER OF VIBRATIONS HAPPENING IN EVERY SECOND.
Aries Triwidajati S. S.Pd SMP Negeri 2 Cileunyi Bandung [email protected]
BASIC COMPETENCE
Describe the vibration and the wave concept and their parameters
Lear nin g Ob je ctiv es Students are able to: 3. Explain the concept of vibration by connecting relevant nature phenomenon. 4. Measure the period and frequency of a vibration of something hung with a rope or spring 5. Use the concept and principle of vibration to calculate the frequency or period. (Using T = 1/f or f = 1/T)
KEY WORD S 1. 2. 3. 4.
VIBRATION FREQUENCY PERIOD AMPLITUDE
150
EXAMPLE: IF THE PENDULUM IS PULLED TO 150, WHAT WILL HAPPEN ?
150
150
B
A O
POINT A : INITIAL POINT POINT B : FINAL POINT POINT O : EQUILIBRIUM
ONE VIBRATION IS DEFINED AS ONE CLOSED TRACK, MEANING THE TRACK OF A MOVEMENT COMING BACK TO ITS ORGINAL PLACE (INITIAL POINT).
B
O
A
QUESTION A. START FROM A B. START FROM B
B
O
A
FINAL INITIALPOINT POINT Point A = ………………………. EQUILIBRIUM Point O = ………………………. FINAL POINT INITIAL POINT Point B = ………………………. B –– O O A A quarter vibration = ……………………….
A half vibration
B –– O O -- B A = A……………………….
A one vibration
A –– O O –– A B –– O O -- B A = B……………………….
PERIOD PERIOD IS THE TIME NEEDED FOR ONE VIBRATION
PERIOD IS SYMBOLIZED BY T. PERIOD IS COUNTED IN SECONDS.
FREQUENCY FREQUENCY IS THE NUMBER OF VIBRATIONS HAPPENING IN EVERY SECOND. THE UNIT OF FREQUENCY ( f ) IS 1 / SECOND, WHICH IS ALSO CALLED ONE HERTZ OR Hz. A FREQUENCY OF 1.000 HERZT IS ALSO CALLED 1 KILOHERTZ OR 1 kHz.
THE RELATION BETWEEN THE FREQUENCY AND PERIOD OF VIBRATION IS f = 1/T OR T = 1/f
EXAMPLE : ACCORDING TO THE FIGURE BELOW, IF IN ITS MOTION PASSING THROUGH POINTS A – O – B – O – A THE PENDULUM NEEDS 20 SECONDS, THE FREQUENCY OF THE VIBRATION OF THE SWING IS 0.05 _____HERTZ
B O A
Known : Vibration = 1 Time = 20 S Asked : f ………? Answered: f = vibration/time = 1/20 = 0.05 hertz
CONCLUSION VIBRATION IS AN OSCILLATION MOVEMENT THROUGH A POINT OF EQUILIBRIUM. PERIOD IS THE TIME NEEDED FOR ONE VIBRATION FREQUENCY IS THE NUMBER OF VIBRATIONS HAPPENING IN EVERY SECOND.
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