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Newton's first law

Dear student, 

The first law of motion: The Law of Inertia.

Every object continues to be in the state of rest or rectilinear motion until an external force acts upon it to change its state of rest or motion. The key point is that if there is no net force acting on an object then the object will maintain a constant velocity. If that velocity is zero, then the object remains at rest. If an external force is applied, the velocity will change because of the force.

Regards 
 

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Newton's first law is also known as law of inertia
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Newton's First Law of Motion. A body at rest remains at rest or, if in motion, remains in motion at constant velocity unless acted on by a net external force
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Derive the Newton first law of motion
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U mean mathematically
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Newton's first law states that a body stays at rest if it is at rest and moves with a constant velocity unit if a net force is applied on it. Newton's second law states that the net force applied on the body is equal to the rate of change in its momentum.

F = ma

or F = m(v-u) / t

or Ft = mv - mu

That is, when F = 0, v = u for whatever time, t is taken. This means that the object will continue moving with uniform velocity, u throughout the time, t. If u is zero than v will also be zero, i.e., object will remain at rest.....( Derivation of Newton's first law of motion from the mathematical expression of the second law of motion.)
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Thanks Anhoni
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Ur welcom..
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