Photo Credit: goo.gl/oP7c9Z
Sir Isaac Newton over 300 years ago discovered the physical principals which explained the motion of aircrafts. In 1686, he proposed the three laws of motion in his book “Principia Mathematica Philosophiae Naturalis”.
Newton’s first law of motion states that any object will remain at rest or in uniform motion unless its state is changed by an external force.
Newton’s second law explains how an object’s velocity changes when an external force is applied on it. This law states that force is equal to the time rate of change of momentum.
Newton’s third law states that there is an equal and opposite reaction for every action. In other words, if a force is applied on object B by object A then an equal and opposite force is applied on object A by object B.
Newton’s First Law of Motion in Detail
This law generally states that every object will remain at rest or in uniform motion unless an external force is applied on it to change its state of rest or motion. This is the definition of Inertia as well. It can be concluded that if no net force is acting on the object then the object will remain at constant velocity. If the constant velocity is zero then the object will be at rest. Velocity of the object will change if a net resultant force is applied on it. Motion of airplane, motion of a rocket or the motion of a ball falling through atmosphere is all examples of this Newton’s first law.
Newton’s Second Law of Motion in Detail
The Newton’s second law of motion states that a force is equal to the time rate of change of momentum. Momentum is defined as the product of mass m and velocity v.
The formula which can be deduced from this law is as follows:
m1=mass of a plane at point “1”,
m0=mass of the plane at point “0”,
v1=velocity of plane at point “1”,
v0=velocity of plane at point “0”,
t1=time at point “1”,
t0=time at point “0”.
Newton’s Third Law of Motion in Detail
His third law of motion is defined as, there is an equal and opposite reaction for each action. For any aircraft, the laws of action and reaction are important. It explains how a lift is generated from an airfoil. In case of a spinning ball, at one side the air gets deflected, and as a result the ball moves in the opposite direction. In case of a jet engine, it gets an upward thrust through action and reaction of its hot gases.Tag(s) : newton, newton's laws, laws of motion, mechanics,