What is first law of motion and fourth law of motion
The first law of Newton is as follows
A body continues to be in the state of rest or Motion unless it is acted upon external unbalanced force.
There is nothing called fourth law of Motion there are only three laws of Motion proposed by Sir Isaac Newton.
Hello Sanket! I would advice you to refer to wikipedia for this as you will get detailed information there and all of your doubts will get cleared too. Hope this helps.