Question

Identify the incorrect statement from the following

• A. Curvilinear and rectilinear motions together form translatory motion.
• B. Periodic motion is always oscillatory.
• C. The motion of a stone dropped from a roof is rectilinear.
• D. The motion of a simple pendulum is periodic.

Answer 1

The correct option is B

Periodic motion is always oscillatory.

All oscillatory motions are periodic because each oscillation gets completed in a definite interval of time. Eg: Motion of a simple pendulum -oscillatory motion.

On the other hand, all periodic motions may not be oscillatory as periodic motion is that motion which repeats itself after equal intervals of time. Eg: Revolution of planets around the Sun is a periodic motion but not an oscillatory motion.