Periodic and Oscillatory Motions
Understanding the definitions, characteristics, and examples of periodic and oscillatory motions, and the distinction between them.
What is Periodic and Oscillatory Motions?
A motion that repeats itself in equal intervals of time.
Key formula / rule: Frequency
Key points
- Define and differentiate between periodic and oscillatory motion.
- Identify examples of both types of motion.
- Understand the concepts of period, frequency, and amplitude.
Common exam trap
Confusing periodic motion with oscillatory motion.
Definitions
- Term
Periodic Motion
- Meaning
A motion that repeats itself in equal intervals of time.
- Term
Oscillatory Motion
- Meaning
A type of periodic motion in which a body oscillates back and forth about a fixed point called the equilibrium position.
- Term
Period (T)
- Meaning
The time taken for one complete oscillation or cycle of motion.
- Term
Frequency (f)
- Meaning
The number of oscillations or cycles completed per unit time.
- Term
Amplitude (A)
- Meaning
The maximum displacement of the oscillating body from its equilibrium position.
- Term
Equilibrium Position
- Meaning
The position of minimum potential energy, about which oscillations occur.
Learning objectives
Define and differentiate between periodic and oscillatory motion.
Identify examples of both types of motion.
Understand the concepts of period, frequency, and amplitude.
Formulae
- Name
Frequency
- Note
Frequency is the reciprocal of the time period.
- Expression
f = 1/T
Prerequisites
Basic understanding of motion and displacement.
Concept of time interval and repetition.
Common mistakes
Confusing periodic motion with oscillatory motion.
Incorrectly identifying the equilibrium position in oscillatory motion.
Assuming all repetitive motions are simple harmonic motions (SHM).
Keywords
Periodic motion
Oscillatory motion
Time period
Frequency
Amplitude
Equilibrium position
Restoring force
Practice preview
Which of the following statements is INCORRECT regarding periodic and oscillatory motions?…
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Which of the following motions is NOT an example of simple harmonic motion?…
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A body is oscillating with simple harmonic motion. Its displacement-time graph is a:…
easy