Physics 101 Lecture 4 - Q 4,6,8 P...

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Chapter 4 The Laws of Motion Dr. Armen Kocharian Q 4,6,8 P 7,12,15,19,26,32,36,38,62,77
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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
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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”
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Contact and Field Forces
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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
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Newton’s First Law ± An object moves with a velocity that is constant in magnitude and direction, unless acted on by a nonzero net force ± The net force is defined as the vector sum of all the external forces exerted on the object
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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
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Inertia ± Is the tendency of an object to continue in its original motion
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Mass ± A measure of the resistance of an object to changes in its motion due to a force ± Scalar quantity ± SI units are kg
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Newton’s Second Law ± The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
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This note was uploaded on 03/05/2011 for the course PHYS 101 taught by Professor Armenn.kocharian during the Fall '10 term at California State University Los Angeles .

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Physics 101 Lecture 4 - Q 4,6,8 P...

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