first law

Every body will persist in its state of rest or of uniform motion (constant velocity) in a straight line unless it is compelled to change that state by forces impressed on it. This means that in the absence of a non-zero net force, the center of mass of a body either is at rest or moves at a constant velocity.

that is Newton's first law of motion. But what does it mean?

This law states that if theresultant force(the vector sum of all forces acting on an object) is zero, then the velocity of the object is constant. Consequently, an object will always stay at rest unless an unbalanced is acted upon it, and a moving object will not change its velocity unless an unbalanced force is acted upon it.an unbalanced force is when a number of forces act on a body simultaneously and the resultant of these forces is zero then the forces are said to be balanced. Equal forces acting on an object in opposite direction. Is when two forces are applied on an objectin a different direction.

There are many exellent examples to depict Newton's first law of motion at work, such as when a pilot changes the throttle of the aeroplane, it shows 'a moving object will not change its velocity unless an unbalanced force is acted upon it. similarly, the first law can be shown as something as simple as kicking a soccer ball or even sliding a book on the floor.

subconciously, Newton's first law is seen everyday.