Circular Motion | Rotatory Motion | Kinematics | Physics With Alka
Circular Motion and Rotatory motion comes under types of motion. It has been always so confusing to differentiate these two terms. Because they are almost similar to each other. No doubt, we can differentiate them a little bit in daily life. But in Physics, it becomes tough to define them separately. So, students always leave this topic or their exams preparation. But, this article will provide you complete and easy definition of Circular Motion and Rotatory Motion with example. So, just keep on reading by scrolling down and enjoy the topic.
Circular Motion
When a particle or a point mass body moves in a circular path is known as circular motion. If you observe this statement, you will see that I have used the word point mass body. The purpose of using this word here is that sometimes we mix it with the rotatory motion. Because its definition is similar to the definition of circular motion. Let’s see how?
Rotatory Motion
It is defined as the motion in which a body which is not a point mass body, is moving such that all its constituent particles moves simultaneously along concentric circles. And centers of these concentric circles lies on a line, called axis of rotation and shift through equal angles in equal interval of time.
Difference between Circular and Rotatory Motion
- Circular motion the body is considered as a single particle whether it consists of number of constituent particles or not. We have to neglect the motion of these particles. But in case of rotatory motion, the motion of all constituent particles will be considered.
- Also in case of circular motion, the path of motion is very large as compare to the size of moving body. But in Rotatory motion, the path of rotation is comparable with the size of body.
- The axis of rotation in case of circular motion lies outside the body. Whereas in rotatory motion, the axis of rotation can lie either inside or outside the body.
Let’s understand with help of example. In picture (a) the motion of man is circular because the path of his motion is clearly much larger than his size. And in this case motion of his constituent particles can be neglected. Also, the axis of rotation is passing through center of the circular which is outside the man’s body.
picture (a)
picture (b)
Originally published at https://www.physicswithalka.online on May 14, 2019.
