Rest And Motion

Whether you are in a classroom...

Or on a busy road...

Whether you are travelling by train...

Or sitting on a desk...

You and the others around you are either moving or just staying still.

Physics, besides dealing with complex sciences, also explains simple everyday observations like movement or staying still.

Physics calls these states as Rest and Motion.

So, let’s learn about Rest and motion

If an object is constantly changing its position with time and with respect to the observer, then it is said to be in motion.

That means if an observer notices that a body changes its position, as time passes, then this body is said to be in motion.

The hands of a working watch, a flowing river and a rotating fan are all in a state of motion.

If a body is not changing its position with time and with respect to the observer, then it is said to be in a state of rest.

That means if an observer notices that a body is not changing its position as time passes by, then this body is said to be at rest

Benches in your classroom, water in a well and a monitor screen are all in state of rest.

Motion and Rest are relative terms.

That means a body may seem to be at rest with respect to you but may appear to be in motion with respect to some other person

Let’s understand this through a small story

Rahul is travelling on a train. For some person who is watching the train from outside, all the passengers will be in motion.

But for Rahul, his fellow passengers are at rest.

But the observer who is outside appears to be in motion.

Similarly, when you are sitting on your desk, you may say that you are at rest.

But for someone who is watching from space, you are moving.

This is why motion and rest are relative terms. They depend on the observer.

This is about Rest and Motion. Let’s take a small recap of what we have learned till now.

Revision

If an object changes its position with time and with respect to the observer, then it is said to be in motion.

If an object does not change its position with time and with respect to an observer, then it is said to be at rest

Motion and Rest are relative terms. They depend on the observer.

The End