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Laws of motion

 Newton's Laws of motion

Newton's first law of  motion:

It states that ,"everybody in this universe continues its state of rest or of uniform motion in a straight line unless an external force is acted upon it. According to this law a body cannot change its state by itself. The property of a body due to which it cannot change its state by itself is called inertia. So Newton's first law of motion is also called law of inertia.

From first  law of motion, a body cannot change its state by itself. some external agency is required to change the state of a body. The external agency which changes the state of a body is called force. Thus, Newton's first law gives definition of force.

Mathematically, Newton's first law of motion can be expressed as 

For F=0  ,    v= constant.


Linear momentum

The product of mass and velocity of a body is called its momentum. It is a vector quantity and denoted by p

i.e  P= mv

Its SI unit is kgm/s


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  1. Zayden WoodMarch 27, 2021 at 5:08 PM

    Very helpful content! Newton's law are very important because they tie into almost everything we see in everyday life. These laws tell us exactly how things move or sit still, like why you don't float out of bed or fall through the floor of your house. Physics tutors know and some tutors teach and relate Newton's laws with real-life examples that how cars work, how water flows, how buildings don't fall down, and basically how everything around us moves. Laws with derivations you presented here in a concise way would help students to prepare for examinations. Keep sharing.

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