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To learn about motion, we first learn what are stationary bodies and moving bodies
Stationary Bodies
Bodies which do not change their position with time are called stationary bodies
In easy language,those bodies which are fixed at one place and do not move are stationary bodies
Example
A tree is stationary(as it does not move)
A house is stationary (as it does not move)
Moving Bodies
Bodies whose position keep on changing are called moving bodies
In easy language,those bodies which are not fixed at one place and keep on moving are called moving objects
Example
A car moves on Road
A bird flies from a tree
When is a body set to be in motion?
A body is said to be in motion when its position keeps on changing,taking a stationary object as reference.
Example
A car moves on Road
Here Road is Stationary but Car is in Motion as position of car is changing with respect to road
Example
A bird flies from a tree
Here, the tree is stationary but bird is in motion as the position of bird is changing with respect to the tree.
Types of Motion
There are many different types of motion. Some common types are
- Linear Motion
- Rotational Motion
- Oscillatory Motion
- Vibration
In this chapter, we only talk about Linear Motion - Motion in a straight line
Note
Sometimes Movement is not visible to Naked Eye
If Movement is fast,we can easily observe it with naked eye
But if movement is slow,its movement cannot be observed easily
Example
it is easier to observe motion of 'seconds hand' of clock
But movement of Hour Hand Cannot be observed easily because movement is slow
