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3 Physical Laws
   
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First law: If an object experiences no net force, then  the object is either at rest (if its velocity is zero), or it moves in a straight line with constant speed (if its velocity is greater than zero).

 

Simply stated:

Newton's First Law of Inertia:

An object will remain in uniform motion in a straight line, unless acted upon by an unbalanced force,  or an object in motion will remain in motion in a straight line unless acted upon by an unbalanced force.  

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Second law: The acceleration a of a body is parallel and directly proportional to the net force F acting on the body, is in the direction of the net force, and is inversely proportional to the mass m of the body, i.e., F = ma

 

 


Newton's Second Law:

The acceleration of an object depends on the mass and the force acting upon it.

 

Formula:

F= ma

 

F= force

m= mass

a= acceleration

 

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Third law: When a first body exerts a force F1 on a second body, the second body simultaneously exerts a force F2 = −F1 on the first body. This means that F1 and F2 are equal in magnitude and opposite in direction.


Newton's Third Law Of Motion:

For every action there is an equal and opposite reaction.


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