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An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Newton’s First Law of Motion is applied to liftoff because: Before firing, the rocket is in state of rest, and its airspeed is zero.

When the engine is fired, the thrust increases from zero and the weight decreases slightly as the fuel burns.

When the thrust is greater than the weight, the net force from thrust to weight is positively upward. The rocket then accelerates upward and the velocity increases.]

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Newton's Second Law of Motion can be stated as:

The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

The key point here is that if there is no net force resulting from unbalanced forces acting on an object (if all the external forces cancel each other out), then the object will maintain a constant velocity. If that velocity is zero, then the object remains at rest. And if an additional external force is applied, the velocity will change because of the force. Newton’s second law of motion determines the amount of the change in velocity.

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Newton’s Third Law of Motion can be stated as: Every action has a reaction equal in magnitude and opposite in direction.

For aircraft, the principal of action and reaction is very important. It helps to explain the generation of lift from an airfoil. In this problem, the air is deflected downward by the action of the airfoil, and in reaction the wing is pushed upward.

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...Sir Isaac Newton, who is considered as one of the greatest fathers of modern science was born December, 25th, 1642 at Woolsthorpe, Lincolnshire, England shortly after his father Isaac Newton I had passed away. Newton faced a more troubled childhood than most of his peers. As his father died prior to his birth, he was raised by his grandmother and had a quarrelsome relationship with his step-father. Newton attended at local primary grammar institutions prior to attending Cambridge University, in 1661. Newton graduated in 1665. When Cambridge University closed for two years as an outcome of the plague, Newton returned to his birthplace, Woolsthorpe, and begun an era of deep study and in a variety of scientific areas, including astronomy, mathematics and mechanics (Westfall, 2010). In 1667 Newton returned to Cambridge to complete a Master of Arts degree. Newton developed a close relationship with Professor Isaac Barrow, who was the Lucasian chair in mathematics at Cambridge. Borrow advocated Newton's research in Mathematics, and as a result Newton was appointed mathematics professor in 1669. (Westfall, 2010). In 1696 Newton was appointed Master of the Mint, the highest position within the English Royal Mint and he departed Cambridge for London (Westfall, 2010). In his later ages Newton expended his time studying alchemy and theology. Although Newton stopped most of his scientific experiments, he was regarded as the dean of English science and was elected President of the Royal...

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