Question

E. Differentiate between
1. Periodic and non-periodic motion.
2. Rotational and circular motion.
3. Vibratory and oscillatory motion.​

Answer 1

Explanation:

1.Periodic motion : A motion which gets repeated after regular intervals of time is called a periodic motion.

Examples : The earth moving around the sun takes 365 days to complete one revolution and this motion gets repeated after every 365 days.

Non-periodic motion : The motion which does not repeat itself after regular interval of time is called non-periodic motion.

Examples : A footballer running on a field, application of brakes in a moving vehicle, a ball rolling down the ground gradually slows down and finally stops, motion of tides in the sea, etc.

2.Rotational motion is based around the idea of rotation of a body about its center of mass. In rotational motion, the axis of rotation and centre of mass could change whereas in circular motion, the axis of rotation and centre of mass does not change.

Circular motion is a movement of an object along the circumference of a circle or rotation along a circular path and can either have a constant angular rotation rate and constant speed, or it can exist with a changing rate of rotation.

3. Oscillation is the definite displacement of a body in terms of distance or time where as vibration is the movement brought about in a body due to oscillation.

• Oscillation takes place in physical, biological systems and often in our society but vibrations is associated with mechanical systems only.

• Oscillation of a body dissipates energy due to friction which slows it down and ultimately ends the movement but it can be converted to a continuous one by applying external force. Vibrations tend to end after the dissipation of all the energy of the atoms.

• Oscillation of a body is used to study the nature of movement and calculations of different energy levels during movement but vibration has a varied range of applications in the industry.

• Oscillation is about a single body where as vibration is the result of collective oscillation of atoms