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Thomas Muloni

Full Sail University

Winter park Florida.

www.thomasmuloni.com 

Physics

            Wednesday, April 24, 2013

Newton’s Laws of Motion

Newton’s laws of motion are physical concepts or theories derived by Sir, Isaac Newton with the second law of motion as a restatement of Galileo’s findings that paved way for Newton’s laws of motion shortly after the death of Galileo in 1642. The discovery of the three laws of motion overturned the Aristotelian theories in physics.  Newton derived three laws of motion that followed the first publication, Newtons Philosophia Naturalis Mathematica also known as pricipia.

1.     Newton’s first law also known as the law of inertia

2.     Newton’s second law of motion

3.     Newton’s third law of motion

Newton’s first law of motion is derived from Galileo’s ideas, called the law of inertia. The law of inertia states that a body in motion continues in it’s state of motion in a straight line unless compelled by another object.  The law of inertia also states that a body at rest remains at in it's state of rest unless acted upon by another force.

Newton’s second law of motion states that Acceleration produced by an object of a net force is directly proportional to the net force of the object and is inversely proportional to it’s mass.

Given by:

a = F/ M

Where a is acceleration, F is the net force, and M is the mass.

An increase in acceleration increases the amount of force applied. If the acceleration is doubled force is doubled as well, and increase in mass decreases the acceleration, thus If the mass is doubled, acceleration is halved

Newton’s third law of motion states that action and reaction forces are equal and opposite. Illustration:  If a man swings a punch weighing 1000 pounds against the wall, the wall will react with an equal force of 1000 pounds in the opposite direction. Action and reaction forces depend on friction and no one force exist with out the other.

Illustration of Newton’s third law of motion:

Newtons third law in action:

Newton’s third law of motion is used to explain how a helicopter is able to take off the ground using a lifting force.

Just before a helicopter takes off the ground, air is forced down by the blades some times known as the wings, which causes a reaction force as the blades or wings force the air up. The upward motion of air causes a lifting force that takes a helicopter or plane off the ground soon as the lifting force over takes the weight of the helicopter. When the lifting force is equal to the weight of the helicopter, it only flies in the midair until the lifting force is greater than the weight of the helicopter. The continuous downward push of air maintains the helicopter in motion, also caused by the forward motion of the helicopter or plane.

Newton's third law a true application in life. 

Citation:

Conceptual Physical Science, Fourth Edition, by Paul G. Hewitt, John A. Suchocki, and Leslie A. Hewitt. Published by Addison-Wesley. Copyright © 2008 by Pearson Education, Inc. Page51.

 (Hewitt 37)

Hewitt. Conceptual Physical Science, 4th Edition. Pearson Learning Solutions. <vbk:0558412157#outline(8)>.