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Newton's First Law states that an object will remain at rest or continue moving at a constant velocity, unless it is acted upon by an external resultant force. When there is no resultant force acting on an object, the object is said to be in equilibrium.
Newton's Second Law states that the acceleration of an object is directly proportional to the force acting on it, in the direction of the force, and inversely proportional to the mass of the object. This means that on object will accelerate in the direction of the resultant force being exerted on it, the value of this acceleration depending on the mass of the object.
Newton's Third Law states that when object A exerts a force on object B, then object B exerts an equal and opposite force on object A. This implies that all forces exist in pairs. These two forces must act on different objects, be of the same type of force and act along the same line and for the same time.
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