nEwton's laws of mOtion

Newton’s laws of motion are physical laws which render involvement between the force acting on a body and the movement of the body.

Isaac Newton, a greatly honored professor at Cambridge University, wrote a treatise entitled De motu corporum, or On the Motion of Bodies in Orbit. It then became the basis of his first compilation, the Philosophiae naturalis principia mathematica. There, Newton mentioned the three laws of motion—the law of inertia, acceleration and interaction. These laws are practical observations of the way matter behaves when subjected to forces. The first law of motion, or law of inertia, states that : “A body at rest remains at rest, and a body already in motion remains in motion with a constant velocity, in the absence of an unbalanced applied force.” Meaning, the object will maintain a constant velocity until a force acts on the object. The second law, or law of acceleration, states that : “The acceleration of an object is directly proportional to the next external force acting on the object inversely proportional to the mass of the object.” This indicates that for an applied force, the change in velocity of the object depends on the mass of the object. The third law, or law of interaction, states that : “When an object exerts a force on another object, the second object exerts on the first a force of the same magnitude but in the opposite direction.” This registers that for every action there is an equal and opposite reaction.

Here are some examples that illustrate Newton’s laws of motion :
First Law
Assume that you are sitting at the back of the car—then it suddenly came to a halt. Your body has inertia, and so a force is needed to change its velocity. The cars floor decelerates your feet but your body moves forward. The force exerted by the car through the chair in front of you gives your body a backward velocity.
Second Law
Suppose your car ran out of gas and stopped. You need to push to the nearest gasoline station. The car will move faster when you and your friends push together. This shows that the greater force you apply, the faster will the car accelerate.
Third Law
Imagine you slapped you ex-best friend in the face. Your hand exerts a force on her face that causes it to move. At the same time that your hand exerts force to her face, her face is also exerting an opposite force on your hand.