An oscillatory motion is a type of motion in which a body moves to and fro about a fixed position repeatedly.
The fixed position about which the body oscillates is called the mean position.
A motion that repeats itself after equal intervals of time is called periodic motion.
All oscillatory motions are periodic, but all periodic motions are not necessarily oscillatory.
When the restoring force acting on a body is directly proportional to its displacement from the mean position and acts towards it, the motion is called simple harmonic motion.
Q1. Oscillatory motion is a motion which is: A) Circular B) Linear C) To and fro about a mean position D) Random Answer: C Q2. The fixed position about which a body oscillates is called: A) Extreme position B) Reference point C) Mean position D) Origin Answer: C Q3. Which of the following is an example of oscillatory motion? A) Motion of a car B) Motion of a fan C) Motion of a pendulum D) Motion of a projectile Answer: C Q4. A motion which repeats itself after equal intervals of time is called: A) Random motion B) Circular motion C) Periodic motion D) Linear motion Answer: C Q5. All oscillatory motions are: A) Random B) Circular C) Periodic D) Non-periodic Answer: C
To and fro motion about a fixed mean position.
Position about which oscillation takes place.
Motion repeating itself after equal time intervals.
Restoring force ∝ displacement and acts towards mean position.
Direct MCQs are asked on definitions of oscillatory motion, periodic motion and mean position.
