The world that we see around us is in constant motion – this is due to the fact that the earth itself is in motion, orbiting the sun at a speed of over 107,000 km/h. But exactly is motion and how do we define it?
If a body is constantly changing its position with respect to time or point of reference, then, that body is said to be in motion. There are various types of motion, namely:
- Uniform Motion
It occurs when equal distances are covered in equal intervals of time by a body. Light travels in uniform motion through a vacuum.
- Non-uniform motion
Unlike uniform motion, a body travels unequal distances in equal intervals of time. A car moving through traffic constitutes non-uniform motion.
- Periodic motion
This is essentially a type of motion that repeats itself at periodic intervals of time. A vibrating tuning fork is an example of periodic motion
- Oscillatory motion
This is a form of periodic motion that occurs in a regular cycle. A sine wave, the swing of a pendulum are examples of oscillatory motion.
Motion class 9 also explains the concept of motion along a straight line, one of the most simple types of motion. It is also called linear motion or rectilinear motion.
Motion Class 9 Notes – Questions
- What do you understand by the term “motion?”
- Explain Uniform Motion
- What is the difference between Uniform and Non-Uniform Motion?
- What is meant by the rate of change of velocity?
- Give 3 examples of circular motion.
To explore more important concepts or questions, refer motion class 9 notes by registering at BYJU’S.