CH-4 NEWTON'S LAWS OF MOTION

CH-4 NEWTON'S LAWS OF MOTION - CHAPTER 4 Dynamics Newton's...

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CHAPTER 4 Dynamics: Newton’s Laws of Motion http://www.physicsclassroom.com/Class/newtlaws/newtltoc.html Force Newton’s First Law of Motion Mass Newton’s Second Law of Motion Newton’s Third Law of Motion Weight – the Force of Gravity; and the Normal Force Solving Problems with Newton’s Laws: Free-Body Diagrams Applications Involving Friction, Inclines Problem Solving – A General Approach Classical Mechanics Describes the relationship between the motion of objects in our everyday world and the forces acting on them Conditions when Classical Mechanics does not apply very tiny objects (< atomic sizes) objects moving near the speed of light Forces Usually think of a force as a push or pull Vector quantity May be a contact force or a field force Contact forces result from physical contact between two objects Field forces act between disconnected objects Also called “action at a distance” Contact and Field Forces 1
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Fundamental Forces Types Strong nuclear force Electromagnetic force Weak nuclear force Gravity Characteristics All field forces Listed in order of decreasing strength Only gravity and electromagnetic in mechanics Sir Isaac Newton 1642 – 1727 Formulated basic concepts and laws of mechanics Universal Gravitation Calculus Light and optics Newton’s First Law of Motion Newton’s first law is often called the law of inertia . Every object continues in its state of rest, or of uniform velocity in a straight line, as long as no net force acts on it. External and Internal Forces External force Any force that results from the interaction between the object and its environment Internal forces Forces that originate within the object itself They cannot change the object’s velocity 2
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Inertia Is the tendency of an object to continue in its original motion. Mass Mass is the measure of inertia of an object. In the SI system, mass is measured in kilograms. Mass is not weight: Mass is a property of an object. Weight is the force exerted on that object by gravity. If you go to the moon, whose gravitational acceleration is about 1/6 g , you will weigh much less. Your mass, however, will be the same. Newton’s Second Law of Motion Newton’s second law is the relation between acceleration and force. Acceleration is proportional to force and inversely proportional to mass. F ma = Units of Force SI unit of force is a Newton (N) 2 11 kg m N s US Customary unit of force is a pound (lb) 1 N = 0.225 lb Force is a vector, so is true along each coordinate axis. Fm a ∑= The unit of force in the SI system is the newton (N). Note that the pound is a unit of force, not of mass, and can therefore be equated to newtons but not to kilograms.
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CH-4 NEWTON'S LAWS OF MOTION - CHAPTER 4 Dynamics Newton's...

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