In view of the coronavirus pandemic, we are making LIVE CLASSES and VIDEO CLASSES completely FREE to prevent interruption in studies
Home > Formulas > Physics Formulas > Angular Frequency Formula
Physics Formulas

Angular Frequency Formula

In wave mechanics, any given wave contains parameters such as frequency, time period, wavelength, amplitude, etc. The angular frequency is an important computation for an object having periodic motion. For example such as a ball at the end of a rope being swung around in a circle, then the rate at which the ball sweeps through a complete 360°. In this article, we will discuss the angular frequency formula with examples. Let us learn the interesting concept!

Angular Frequency Formula

What is the angular frequency?

To understand this quantity, we need to understand a natural quantity as a time period. The time period of an oscillating object is the amount of time it takes to complete one oscillation. For example, the period for the motion of the Earth around the Sun is 365 days.

Angular Frequency Formula

                                                                                                                                                                        Source: youtube.com

The time period is the time taken by a complete cycle of the wave to pass a point, frequency is the number of the complete cycle of waves passing a point in unit time. Angular frequency is the angular displacement of any element of the wave per unit time. Also, in wave terminology for a sinusoidal wave, the angular frequency refers to the angular displacement of any element of the wave per unit time. It is represented by \( \omega \)

A frequency is a rate, so, the dimensions of this quantity are radians per unit time. The units will depend on the specific problem taken. If we are talking about the rotation of a merry-go-round, then we may want to talk about angular frequency in radians per minute. On the other hand, the angular frequency of the Moon around the Earth will be in radians per day.

Get the huge list of Physics Formulas here

Angular Frequency Formula

To know about the rate at which the rotations are occurring, we need to find the angular frequency. The frequency of rotation i.e. how many rotations take place in a certain amount of time can be computed as:

f = \( \frac{1}{T}\)

In the case of the Earth, one rotation takes 365 days, thus

f =\( \frac{1}{365}\)

The formula for angular frequency is the oscillation frequency ‘f’ measured in oscillations per second, multiplied by the angle through which the body moves. The angular frequency formula for an object which completes a full oscillation or rotation is computed as:

\( \omega = 2\pi f \)

Also in terms of the time period, we compute angular frequency as:

\( \omega =\frac{2\pi}{T} \)

For example, the angular frequency for the above case will be

\( \omega =\frac{2\pi}{365} \)

Thus the Earth moves through angle \( 2\pi \) radians in 365 days.

Angular frequency is a scalar quantity, it means it is just a magnitude. But, sometimes we talk about angular velocity, which is a vector. Therefore, the angular velocity formula is the same as the equation for angular frequency.

Its SI unit is rad/sec.

Where,

\( \omega \) angular frequency of the wave
T the time period of the wave
f ordinary frequency of the wave

Solved Examples on Angular Frequency Formula

Q.1: Calculate the angular frequency of an oscillating object with a time period of 30 seconds.

Solution: As given,

T= 30 sec

Applying the formula,

\( \omega =\frac{2\pi}{T} \)

Substituting the values,

\( \omega =\frac{2\pi}{30}\)

= \( \frac{360°}{30}\)

\( \omega = 12 ° sec^{-1} \)

Therefore angular frequency is 12° /sec

Share with friends

Customize your course in 30 seconds

Which class are you in?
5th
6th
7th
8th
9th
10th
11th
12th
Get ready for all-new Live Classes!
Now learn Live with India's best teachers. Join courses with the best schedule and enjoy fun and interactive classes.
tutor
tutor
Ashhar Firdausi
IIT Roorkee
Biology
tutor
tutor
Dr. Nazma Shaik
VTU
Chemistry
tutor
tutor
Gaurav Tiwari
APJAKTU
Physics
Get Started

Leave a Reply

avatar
  Subscribe  
Notify of

Get Question Papers of Last 10 Years

Which class are you in?
No thanks.