write Newton's first law and explain
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✴ NEWTON'S FIRST LAW OF MOTION :
If no force is acting on a body, it's velocity does not change, i.e. the body does not accelerate. In other words, if a body is stationary, it will remain stationary. If it is in motion, it will continue moving with the same velocity and in the same direction.
Suppose, you place the 1 kilogram standard weight on a surface with no friction and pull it with an acceleration of 1m/s², the force applied is called 1N (1 Newton).
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The first law states that if the net force (the vector sum of all forces acting on an object) is zero, then the velocity of the object is constant. Velocity is a vector quantity which expresses both the object's speed and the direction of its motion; therefore, the statement that the object's velocity is constant is a statement that both its speed and the direction of its motion are constant.
An object that is at rest will stay at rest unless a force acts upon it.
An object that is in motion will not change its velocity unless a force acts upon it.
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