Newton's Laws :
First Law (Law of Inertia): An object will stay at rest or keep moving at a constant velocity unless acted upon by an external force.
Second Law (F = ma): The force acting on an object is proportional to the rate of change of its momentum mv. In the case of constant mass and with the choice of suitable units F = ma .
Third Law (Action-Reaction Law): For every action, there is an equal and opposite reaction.
First Law (Law of Inertia): An object will stay at rest or keep moving at a constant velocity unless acted upon by an external force.
Second Law (F = ma): The force acting on an object is proportional to the rate of change of its momentum mv. In the case of constant mass and with the choice of suitable units F = ma .
Third Law (Action-Reaction Law): For every action, there is an equal and opposite reaction.
Significance : Newton's Laws are important because they give us a clear way to describe and predict how objects move when forces act on them. These laws are the foundation of classical mechanics and are essential in fields like engineering, astronomy, and everyday situations involving force and motion.
Examples
First Law : If we are in a moving car that suddenly stops, our body tends to keep moving forward even though the car has stopped, which is why seat belts are essential—they provide the external force needed to stop your body safely. This tendency to keep moving in the same direction until an outside force acts is an illustration of inertia.
Second Law : When we hit cricket ball with a bat, the more force we apply to the ball the more momentum the ball gains.
Third Law : The flapping of a bird's wings is a good example of Newton's Third Law. When a bird pushes its wings downward, it exerts a force on the air. According to Newton's Third Law, the air pushes back with an equal and opposite force, propelling the bird upward and forward. This action-reaction pair allows the bird to stay in the air and control its direction while flying.