Exergy Academy

  9. How does rotatory motion differ from circular motion? The main difference between these types of motion is that circular motion is a special case of rotational motion, where the distance between the body’s Centre of mass and the axis of rotation remains fixed. In rotatory motion, a body rotates on its own axis (passing through it) while in circular motion, anybody/particle moves on a circular path with centre outside the body. Rotational motion is based around the idea of rotation of a body about its Centre 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.

    What is meant by circular motion? Give one example. Circular motion -  the motion of a body along a circular path is known as circular motion.   The direction of motion is constantly changing in circular motion.   Example  - when a person whirls a stone tied by a string, the motion of the stone is an example of circular motion.

  7. What is rotatory motion? Give two examples. Rotatory motion  - a body is said to be in rotatory motion if it moves about a fixed axis. A spinning wheel is an example of rotatory motion. It moves in a circular path about a fixed axis. Similarly, the rotating fan is another example of rotatory motion.

  6. Explain the meanings of  (i) rectilinear motion, and  (ii) curvilinear motion. Give one example of each. Rectilinear motion  -  if the motion of a body is along a straight line, it is known as rectilinear motion. Rectilinear motion is also called linear motion. An apple falling from height falling on earth and a car moving in a straight path are examples of rectilinear motion. Curvilinear motion -  if the motion of a body is along a curved path, it is known as curvilinear motion. The direction of motion is constantly changing in this motion. The cyclist taking a turn and the path of a stone thrown in the sky are examples of curvilinear motion.

    What do you mean by translatory motion? Give one example.          A motion in which all the points of the object move through the same distance in equal intervals of time is called translatory motion. Example - motion of a person walking on a road is an example of translatory motion.

Name five different types of motion you know. Explanation:  following are the five different types of motion: 1.  Vibratory motion. 2.  Linear motion. 3.  Oscillatory motion. 4.  Circular motion. 5.  Rotatory motion.