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### NEWTON’S LAW OF MOTION The problems of mechanics can be solved by applying Newton’s laws of motion, described as follows:

#### 1) FIRST LAW OF MOTION: -

Newton’s first law of motion states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.

The first law of motion is normally taken as the definition of inertia. 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. #### 2) SECOND LAW OF MOTION:-

Newton’s second law of motion states that if the resultant force acting on a particle is not zero, the particle will have an acceleration proportional to the magnitude of the resultant and in the direction of this resultant force. The law explains how the velocity of an object changes when it is subjected to an external force. The law defines a force to be equal to changes in momentum per unit time.

For an object with a constant mass m, Newton’s second law of motion states that the force F is the product of an object’s mass and its acceleration a.  For an externally applied force, the changes in velocity depends on the mass of the object. A force will cause a change in velocity, and likewise, a change in velocity will generate a force. The above equation works in both ways.

#### 3) THIRD LAW OF MOTION:-

Newton’s third law of motion states that for every action in nature there is an equal and opposite reaction. In other words, if object A exerts a force on object B, then object B also exerts an equal forces on object A. The third law of motion can be used to explain the generation of lift by a wing and the production of thrust by a jet engine.